drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <net/tcp.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_iscsi.h>
  34 #include <scsi/iscsi_if.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_bsg_iscsi.h>
  37
  38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  39
  40 static int dbg_session;
  41 module_param_named(debug_session, dbg_session, int,
  42                    S_IRUGO | S_IWUSR);
  43 MODULE_PARM_DESC(debug_session,
  44                  "Turn on debugging for sessions in scsi_transport_iscsi "
  45                  "module. Set to 1 to turn on, and zero to turn off. Default "
  46                  "is off.");
  47
  48 static int dbg_conn;
  49 module_param_named(debug_conn, dbg_conn, int,
  50                    S_IRUGO | S_IWUSR);
  51 MODULE_PARM_DESC(debug_conn,
  52                  "Turn on debugging for connections in scsi_transport_iscsi "
  53                  "module. Set to 1 to turn on, and zero to turn off. Default "
  54                  "is off.");
  55
  56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  57         do {                                                            \
  58                 if (dbg_session)                                        \
  59                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  60                                                  "%s: " dbg_fmt,        \
  61                                                  __func__, ##arg);      \
  62         } while (0);
  63
  64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  65         do {                                                            \
  66                 if (dbg_conn)                                           \
  67                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  68                                               "%s: " dbg_fmt,           \
  69                                               __func__, ##arg); \
  70         } while (0);
  71
  72 struct iscsi_internal {
  73         struct scsi_transport_template t;
  74         struct iscsi_transport *iscsi_transport;
  75         struct list_head list;
  76         struct device dev;
  77
  78         struct transport_container conn_cont;
  79         struct transport_container session_cont;
  80 };
  81
  82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  83 static struct workqueue_struct *iscsi_eh_timer_workq;
  84
  85 static DEFINE_IDA(iscsi_sess_ida);
  86 /*
  87  * list of registered transports and lock that must
  88  * be held while accessing list. The iscsi_transport_lock must
  89  * be acquired after the rx_queue_mutex.
  90  */
  91 static LIST_HEAD(iscsi_transports);
  92 static DEFINE_SPINLOCK(iscsi_transport_lock);
  93
  94 #define to_iscsi_internal(tmpl) \
  95         container_of(tmpl, struct iscsi_internal, t)
  96
  97 #define dev_to_iscsi_internal(_dev) \
  98         container_of(_dev, struct iscsi_internal, dev)
  99
 100 static void iscsi_transport_release(struct device *dev)
 101 {
 102         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 103         kfree(priv);
 104 }
 105
 106 /*
 107  * iscsi_transport_class represents the iscsi_transports that are
 108  * registered.
 109  */
 110 static struct class iscsi_transport_class = {
 111         .name = "iscsi_transport",
 112         .dev_release = iscsi_transport_release,
 113 };
 114
 115 static ssize_t
 116 show_transport_handle(struct device *dev, struct device_attribute *attr,
 117                       char *buf)
 118 {
 119         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 120         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 121 }
 122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 123
 124 #define show_transport_attr(name, format)                               \
 125 static ssize_t                                                          \
 126 show_transport_##name(struct device *dev,                               \
 127                       struct device_attribute *attr,char *buf)          \
 128 {                                                                       \
 129         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 130         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 131 }                                                                       \
 132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 133
 134 show_transport_attr(caps, "0x%x");
 135
 136 static struct attribute *iscsi_transport_attrs[] = {
 137         &dev_attr_handle.attr,
 138         &dev_attr_caps.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group iscsi_transport_group = {
 143         .attrs = iscsi_transport_attrs,
 144 };
 145
 146 /*
 147  * iSCSI endpoint attrs
 148  */
 149 #define iscsi_dev_to_endpoint(_dev) \
 150         container_of(_dev, struct iscsi_endpoint, dev)
 151
 152 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 153 struct device_attribute dev_attr_##_prefix##_##_name =  \
 154         __ATTR(_name,_mode,_show,_store)
 155
 156 static void iscsi_endpoint_release(struct device *dev)
 157 {
 158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159         kfree(ep);
 160 }
 161
 162 static struct class iscsi_endpoint_class = {
 163         .name = "iscsi_endpoint",
 164         .dev_release = iscsi_endpoint_release,
 165 };
 166
 167 static ssize_t
 168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 169 {
 170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 171         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 172 }
 173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 174
 175 static struct attribute *iscsi_endpoint_attrs[] = {
 176         &dev_attr_ep_handle.attr,
 177         NULL,
 178 };
 179
 180 static struct attribute_group iscsi_endpoint_group = {
 181         .attrs = iscsi_endpoint_attrs,
 182 };
 183
 184 #define ISCSI_MAX_EPID -1
 185
 186 static int iscsi_match_epid(struct device *dev, const void *data)
 187 {
 188         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 189         const uint64_t *epid = data;
 190
 191         return *epid == ep->id;
 192 }
 193
 194 struct iscsi_endpoint *
 195 iscsi_create_endpoint(int dd_size)
 196 {
 197         struct device *dev;
 198         struct iscsi_endpoint *ep;
 199         uint64_t id;
 200         int err;
 201
 202         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 203                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 204                                         iscsi_match_epid);
 205                 if (!dev)
 206                         break;
 207                 else
 208                         put_device(dev);
 209         }
 210         if (id == ISCSI_MAX_EPID) {
 211                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 212                        ISCSI_MAX_EPID - 1);
 213                 return NULL;
 214         }
 215
 216         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 217         if (!ep)
 218                 return NULL;
 219
 220         ep->id = id;
 221         ep->dev.class = &iscsi_endpoint_class;
 222         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 223         err = device_register(&ep->dev);
 224         if (err)
 225                 goto free_ep;
 226
 227         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 228         if (err)
 229                 goto unregister_dev;
 230
 231         if (dd_size)
 232                 ep->dd_data = &ep[1];
 233         return ep;
 234
 235 unregister_dev:
 236         device_unregister(&ep->dev);
 237         return NULL;
 238
 239 free_ep:
 240         kfree(ep);
 241         return NULL;
 242 }
 243 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 244
 245 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 246 {
 247         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 248         device_unregister(&ep->dev);
 249 }
 250 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 251
 252 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 253 {
 254         struct iscsi_endpoint *ep;
 255         struct device *dev;
 256
 257         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 258                                 iscsi_match_epid);
 259         if (!dev)
 260                 return NULL;
 261
 262         ep = iscsi_dev_to_endpoint(dev);
 263         /*
 264          * we can drop this now because the interface will prevent
 265          * removals and lookups from racing.
 266          */
 267         put_device(dev);
 268         return ep;
 269 }
 270 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 271
 272 /*
 273  * Interface to display network param to sysfs
 274  */
 275
 276 static void iscsi_iface_release(struct device *dev)
 277 {
 278         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 279         struct device *parent = iface->dev.parent;
 280
 281         kfree(iface);
 282         put_device(parent);
 283 }
 284
 285
 286 static struct class iscsi_iface_class = {
 287         .name = "iscsi_iface",
 288         .dev_release = iscsi_iface_release,
 289 };
 290
 291 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 292 struct device_attribute dev_attr_##_prefix##_##_name =          \
 293         __ATTR(_name, _mode, _show, _store)
 294
 295 /* iface attrs show */
 296 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 297 static ssize_t                                                          \
 298 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 299                      char *buf)                                         \
 300 {                                                                       \
 301         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 302         struct iscsi_transport *t = iface->transport;                   \
 303         return t->get_iface_param(iface, param_type, param, buf);       \
 304 }                                                                       \
 305
 306 #define iscsi_iface_net_attr(type, name, param)                         \
 307         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 308 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 309
 310 #define iscsi_iface_attr(type, name, param)                             \
 311         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 312 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 313
 314 /* generic read only ipv4 attribute */
 315 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 316 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 317 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 318 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 319 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 320                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 321 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 322                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 323 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 324 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 325 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 326                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 327 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 328                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 329 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 330                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 331 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 332                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 333 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 334                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 335 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 336                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 337 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 338                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 339 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 340                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 341 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 342                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 343 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 344
 345 /* generic read only ipv6 attribute */
 346 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 347 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 348                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 349 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 350 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 351                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 352 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 353                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 354 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 355                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 356 iscsi_iface_net_attr(ipv6_iface, router_state,
 357                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 358 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 359                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 360 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 361 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 362 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 363                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 364 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 365 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 366                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 367 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 368                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 369 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 370                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 371 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 372                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 373 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 374                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 375
 376 /* common read only iface attribute */
 377 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 378 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 379 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 380 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 381 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 382 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 383 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 384 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 385 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 386                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 387 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 388 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 389 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 390 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 391 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 392 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 393
 394 /* common iscsi specific settings attributes */
 395 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 396 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 397 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 398 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 399 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 400 iscsi_iface_attr(iface, data_seq_in_order,
 401                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 402 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 403 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 404 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 405 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 406 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 407 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 408 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 409 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 410 iscsi_iface_attr(iface, discovery_auth_optional,
 411                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 412 iscsi_iface_attr(iface, discovery_logout,
 413                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 414 iscsi_iface_attr(iface, strict_login_comp_en,
 415                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 416 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 417
 418 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 419                                           struct attribute *attr, int i)
 420 {
 421         struct device *dev = container_of(kobj, struct device, kobj);
 422         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 423         struct iscsi_transport *t = iface->transport;
 424         int param;
 425         int param_type;
 426
 427         if (attr == &dev_attr_iface_enabled.attr)
 428                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 429         else if (attr == &dev_attr_iface_vlan_id.attr)
 430                 param = ISCSI_NET_PARAM_VLAN_ID;
 431         else if (attr == &dev_attr_iface_vlan_priority.attr)
 432                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 433         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 434                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 435         else if (attr == &dev_attr_iface_mtu.attr)
 436                 param = ISCSI_NET_PARAM_MTU;
 437         else if (attr == &dev_attr_iface_port.attr)
 438                 param = ISCSI_NET_PARAM_PORT;
 439         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 440                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 441         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 442                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 443         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 444                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 445         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 446                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 447         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 448                 param = ISCSI_NET_PARAM_TCP_WSF;
 449         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 450                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 451         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 452                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 453         else if (attr == &dev_attr_iface_cache_id.attr)
 454                 param = ISCSI_NET_PARAM_CACHE_ID;
 455         else if (attr == &dev_attr_iface_redirect_en.attr)
 456                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 457         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 458                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 459         else if (attr == &dev_attr_iface_header_digest.attr)
 460                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 461         else if (attr == &dev_attr_iface_data_digest.attr)
 462                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 463         else if (attr == &dev_attr_iface_immediate_data.attr)
 464                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 465         else if (attr == &dev_attr_iface_initial_r2t.attr)
 466                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 467         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 468                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 469         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 470                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 471         else if (attr == &dev_attr_iface_erl.attr)
 472                 param = ISCSI_IFACE_PARAM_ERL;
 473         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 474                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 475         else if (attr == &dev_attr_iface_first_burst_len.attr)
 476                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 477         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 478                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 479         else if (attr == &dev_attr_iface_max_burst_len.attr)
 480                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 481         else if (attr == &dev_attr_iface_chap_auth.attr)
 482                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 483         else if (attr == &dev_attr_iface_bidi_chap.attr)
 484                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 485         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 486                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 487         else if (attr == &dev_attr_iface_discovery_logout.attr)
 488                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 489         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 490                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 491         else if (attr == &dev_attr_iface_initiator_name.attr)
 492                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 493         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 494                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 495                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 496                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 497                         param = ISCSI_NET_PARAM_IPV4_GW;
 498                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 499                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 500                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 501                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 502                 else if (attr ==
 503                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 505                 else if (attr ==
 506                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 507                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 508                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 509                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 510                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 511                         param = ISCSI_NET_PARAM_IPV4_TOS;
 512                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 513                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 514                 else if (attr ==
 515                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 517                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 519                 else if (attr ==
 520                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 522                 else if (attr ==
 523                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 524                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 525                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 526                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 527                 else if (attr ==
 528                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 529                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 530                 else if (attr ==
 531                          &dev_attr_ipv4_iface_fragment_disable.attr)
 532                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 533                 else if (attr ==
 534                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_TTL;
 538                 else
 539                         return 0;
 540         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 541                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 542                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 543                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 544                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 545                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 546                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 547                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 548                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 549                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 550                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 551                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 552                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 553                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 554                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 555                 else if (attr ==
 556                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 558                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 560                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 562                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 564                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 566                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 568                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 570                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 572                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 574                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 575                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 576                 else
 577                         return 0;
 578         } else {
 579                 WARN_ONCE(1, "Invalid iface attr");
 580                 return 0;
 581         }
 582
 583         switch (param) {
 584         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 585         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 586         case ISCSI_IFACE_PARAM_DATADGST_EN:
 587         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 588         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 589         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 590         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 591         case ISCSI_IFACE_PARAM_ERL:
 592         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 593         case ISCSI_IFACE_PARAM_FIRST_BURST:
 594         case ISCSI_IFACE_PARAM_MAX_R2T:
 595         case ISCSI_IFACE_PARAM_MAX_BURST:
 596         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 597         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 598         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 599         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 600         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 601         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 602                 param_type = ISCSI_IFACE_PARAM;
 603                 break;
 604         default:
 605                 param_type = ISCSI_NET_PARAM;
 606         }
 607
 608         return t->attr_is_visible(param_type, param);
 609 }
 610
 611 static struct attribute *iscsi_iface_attrs[] = {
 612         &dev_attr_iface_enabled.attr,
 613         &dev_attr_iface_vlan_id.attr,
 614         &dev_attr_iface_vlan_priority.attr,
 615         &dev_attr_iface_vlan_enabled.attr,
 616         &dev_attr_ipv4_iface_ipaddress.attr,
 617         &dev_attr_ipv4_iface_gateway.attr,
 618         &dev_attr_ipv4_iface_subnet.attr,
 619         &dev_attr_ipv4_iface_bootproto.attr,
 620         &dev_attr_ipv6_iface_ipaddress.attr,
 621         &dev_attr_ipv6_iface_link_local_addr.attr,
 622         &dev_attr_ipv6_iface_router_addr.attr,
 623         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 624         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 625         &dev_attr_iface_mtu.attr,
 626         &dev_attr_iface_port.attr,
 627         &dev_attr_iface_ipaddress_state.attr,
 628         &dev_attr_iface_delayed_ack_en.attr,
 629         &dev_attr_iface_tcp_nagle_disable.attr,
 630         &dev_attr_iface_tcp_wsf_disable.attr,
 631         &dev_attr_iface_tcp_wsf.attr,
 632         &dev_attr_iface_tcp_timer_scale.attr,
 633         &dev_attr_iface_tcp_timestamp_en.attr,
 634         &dev_attr_iface_cache_id.attr,
 635         &dev_attr_iface_redirect_en.attr,
 636         &dev_attr_iface_def_taskmgmt_tmo.attr,
 637         &dev_attr_iface_header_digest.attr,
 638         &dev_attr_iface_data_digest.attr,
 639         &dev_attr_iface_immediate_data.attr,
 640         &dev_attr_iface_initial_r2t.attr,
 641         &dev_attr_iface_data_seq_in_order.attr,
 642         &dev_attr_iface_data_pdu_in_order.attr,
 643         &dev_attr_iface_erl.attr,
 644         &dev_attr_iface_max_recv_dlength.attr,
 645         &dev_attr_iface_first_burst_len.attr,
 646         &dev_attr_iface_max_outstanding_r2t.attr,
 647         &dev_attr_iface_max_burst_len.attr,
 648         &dev_attr_iface_chap_auth.attr,
 649         &dev_attr_iface_bidi_chap.attr,
 650         &dev_attr_iface_discovery_auth_optional.attr,
 651         &dev_attr_iface_discovery_logout.attr,
 652         &dev_attr_iface_strict_login_comp_en.attr,
 653         &dev_attr_iface_initiator_name.attr,
 654         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 655         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 656         &dev_attr_ipv4_iface_tos_en.attr,
 657         &dev_attr_ipv4_iface_tos.attr,
 658         &dev_attr_ipv4_iface_grat_arp_en.attr,
 659         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 661         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 662         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 663         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 664         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 665         &dev_attr_ipv4_iface_fragment_disable.attr,
 666         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 667         &dev_attr_ipv4_iface_ttl.attr,
 668         &dev_attr_ipv6_iface_link_local_state.attr,
 669         &dev_attr_ipv6_iface_router_state.attr,
 670         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 671         &dev_attr_ipv6_iface_mld_en.attr,
 672         &dev_attr_ipv6_iface_flow_label.attr,
 673         &dev_attr_ipv6_iface_traffic_class.attr,
 674         &dev_attr_ipv6_iface_hop_limit.attr,
 675         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 676         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 677         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 678         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 679         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 680         NULL,
 681 };
 682
 683 static struct attribute_group iscsi_iface_group = {
 684         .attrs = iscsi_iface_attrs,
 685         .is_visible = iscsi_iface_attr_is_visible,
 686 };
 687
 688 /* convert iscsi_ipaddress_state values to ascii string name */
 689 static const struct {
 690         enum iscsi_ipaddress_state      value;
 691         char                            *name;
 692 } iscsi_ipaddress_state_names[] = {
 693         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 694         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 695         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 696         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 697         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 698         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 699         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 700 };
 701
 702 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 703 {
 704         int i;
 705         char *state = NULL;
 706
 707         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 708                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 709                         state = iscsi_ipaddress_state_names[i].name;
 710                         break;
 711                 }
 712         }
 713         return state;
 714 }
 715 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 716
 717 /* convert iscsi_router_state values to ascii string name */
 718 static const struct {
 719         enum iscsi_router_state value;
 720         char                    *name;
 721 } iscsi_router_state_names[] = {
 722         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 723         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 724         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 725         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 726 };
 727
 728 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 729 {
 730         int i;
 731         char *state = NULL;
 732
 733         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 734                 if (iscsi_router_state_names[i].value == router_state) {
 735                         state = iscsi_router_state_names[i].name;
 736                         break;
 737                 }
 738         }
 739         return state;
 740 }
 741 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 742
 743 struct iscsi_iface *
 744 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 745                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 746 {
 747         struct iscsi_iface *iface;
 748         int err;
 749
 750         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 751         if (!iface)
 752                 return NULL;
 753
 754         iface->transport = transport;
 755         iface->iface_type = iface_type;
 756         iface->iface_num = iface_num;
 757         iface->dev.release = iscsi_iface_release;
 758         iface->dev.class = &iscsi_iface_class;
 759         /* parent reference released in iscsi_iface_release */
 760         iface->dev.parent = get_device(&shost->shost_gendev);
 761         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 762                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 763                              iface_num);
 764         else
 765                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 766                              iface_num);
 767
 768         err = device_register(&iface->dev);
 769         if (err)
 770                 goto free_iface;
 771
 772         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 773         if (err)
 774                 goto unreg_iface;
 775
 776         if (dd_size)
 777                 iface->dd_data = &iface[1];
 778         return iface;
 779
 780 unreg_iface:
 781         device_unregister(&iface->dev);
 782         return NULL;
 783
 784 free_iface:
 785         put_device(iface->dev.parent);
 786         kfree(iface);
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 790
 791 void iscsi_destroy_iface(struct iscsi_iface *iface)
 792 {
 793         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 794         device_unregister(&iface->dev);
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 797
 798 /*
 799  * Interface to display flash node params to sysfs
 800  */
 801
 802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 803 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 804         __ATTR(_name, _mode, _show, _store)
 805
 806 /* flash node session attrs show */
 807 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 808 static ssize_t                                                          \
 809 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 810                      char *buf)                                         \
 811 {                                                                       \
 812         struct iscsi_bus_flash_session *fnode_sess =                    \
 813                                         iscsi_dev_to_flash_session(dev);\
 814         struct iscsi_transport *t = fnode_sess->transport;              \
 815         return t->get_flashnode_param(fnode_sess, param, buf);          \
 816 }                                                                       \
 817
 818
 819 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 820         iscsi_flashnode_sess_attr_show(type, name, param)               \
 821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 822                             show_##type##_##name, NULL);
 823
 824 /* Flash node session attributes */
 825
 826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 827                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 828 iscsi_flashnode_sess_attr(fnode, discovery_session,
 829                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 835                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 837                           ISCSI_FLASHNODE_PDU_INORDER);
 838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 840                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 843                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 848                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 854                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 861                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 869
 870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 871         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 872         &dev_attr_fnode_discovery_session.attr,
 873         &dev_attr_fnode_portal_type.attr,
 874         &dev_attr_fnode_entry_enable.attr,
 875         &dev_attr_fnode_immediate_data.attr,
 876         &dev_attr_fnode_initial_r2t.attr,
 877         &dev_attr_fnode_data_seq_in_order.attr,
 878         &dev_attr_fnode_data_pdu_in_order.attr,
 879         &dev_attr_fnode_chap_auth.attr,
 880         &dev_attr_fnode_discovery_logout.attr,
 881         &dev_attr_fnode_bidi_chap.attr,
 882         &dev_attr_fnode_discovery_auth_optional.attr,
 883         &dev_attr_fnode_erl.attr,
 884         &dev_attr_fnode_first_burst_len.attr,
 885         &dev_attr_fnode_def_time2wait.attr,
 886         &dev_attr_fnode_def_time2retain.attr,
 887         &dev_attr_fnode_max_outstanding_r2t.attr,
 888         &dev_attr_fnode_isid.attr,
 889         &dev_attr_fnode_tsid.attr,
 890         &dev_attr_fnode_max_burst_len.attr,
 891         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 892         &dev_attr_fnode_targetalias.attr,
 893         &dev_attr_fnode_targetname.attr,
 894         &dev_attr_fnode_tpgt.attr,
 895         &dev_attr_fnode_discovery_parent_idx.attr,
 896         &dev_attr_fnode_discovery_parent_type.attr,
 897         &dev_attr_fnode_chap_in_idx.attr,
 898         &dev_attr_fnode_chap_out_idx.attr,
 899         &dev_attr_fnode_username.attr,
 900         &dev_attr_fnode_username_in.attr,
 901         &dev_attr_fnode_password.attr,
 902         &dev_attr_fnode_password_in.attr,
 903         &dev_attr_fnode_is_boot_target.attr,
 904         NULL,
 905 };
 906
 907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 908                                                     struct attribute *attr,
 909                                                     int i)
 910 {
 911         struct device *dev = container_of(kobj, struct device, kobj);
 912         struct iscsi_bus_flash_session *fnode_sess =
 913                                                 iscsi_dev_to_flash_session(dev);
 914         struct iscsi_transport *t = fnode_sess->transport;
 915         int param;
 916
 917         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 918                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 919         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 921         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 922                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 923         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 924                 param = ISCSI_FLASHNODE_ENTRY_EN;
 925         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 926                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 927         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 928                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 929         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 931         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 932                 param = ISCSI_FLASHNODE_PDU_INORDER;
 933         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 934                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 937         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 938                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 939         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 940                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 941         } else if (attr == &dev_attr_fnode_erl.attr) {
 942                 param = ISCSI_FLASHNODE_ERL;
 943         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 944                 param = ISCSI_FLASHNODE_FIRST_BURST;
 945         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 947         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 948                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 949         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 950                 param = ISCSI_FLASHNODE_MAX_R2T;
 951         } else if (attr == &dev_attr_fnode_isid.attr) {
 952                 param = ISCSI_FLASHNODE_ISID;
 953         } else if (attr == &dev_attr_fnode_tsid.attr) {
 954                 param = ISCSI_FLASHNODE_TSID;
 955         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 956                 param = ISCSI_FLASHNODE_MAX_BURST;
 957         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 958                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 959         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 960                 param = ISCSI_FLASHNODE_ALIAS;
 961         } else if (attr == &dev_attr_fnode_targetname.attr) {
 962                 param = ISCSI_FLASHNODE_NAME;
 963         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 964                 param = ISCSI_FLASHNODE_TPGT;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 967         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 968                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 969         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 971         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 972                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 973         } else if (attr == &dev_attr_fnode_username.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME;
 975         } else if (attr == &dev_attr_fnode_username_in.attr) {
 976                 param = ISCSI_FLASHNODE_USERNAME_IN;
 977         } else if (attr == &dev_attr_fnode_password.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD;
 979         } else if (attr == &dev_attr_fnode_password_in.attr) {
 980                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 981         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 982                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 983         } else {
 984                 WARN_ONCE(1, "Invalid flashnode session attr");
 985                 return 0;
 986         }
 987
 988         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 989 }
 990
 991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 992         .attrs = iscsi_flashnode_sess_attrs,
 993         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 994 };
 995
 996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 997         &iscsi_flashnode_sess_attr_group,
 998         NULL,
 999 };
1000
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003         struct iscsi_bus_flash_session *fnode_sess =
1004                                                 iscsi_dev_to_flash_session(dev);
1005
1006         kfree(fnode_sess->targetname);
1007         kfree(fnode_sess->targetalias);
1008         kfree(fnode_sess->portal_type);
1009         kfree(fnode_sess);
1010 }
1011
1012 struct device_type iscsi_flashnode_sess_dev_type = {
1013         .name = "iscsi_flashnode_sess_dev_type",
1014         .groups = iscsi_flashnode_sess_attr_groups,
1015         .release = iscsi_flashnode_sess_release,
1016 };
1017
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1020 static ssize_t                                                          \
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022                      char *buf)                                         \
1023 {                                                                       \
1024         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025         struct iscsi_bus_flash_session *fnode_sess =                    \
1026                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1027         struct iscsi_transport *t = fnode_conn->transport;              \
1028         return t->get_flashnode_param(fnode_sess, param, buf);          \
1029 }                                                                       \
1030
1031
1032 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1033         iscsi_flashnode_conn_attr_show(type, name, param)               \
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1035                             show_##type##_##name, NULL);
1036
1037 /* Flash node connection attributes */
1038
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081         &dev_attr_fnode_header_digest.attr,
1082         &dev_attr_fnode_data_digest.attr,
1083         &dev_attr_fnode_snack_req.attr,
1084         &dev_attr_fnode_tcp_timestamp_stat.attr,
1085         &dev_attr_fnode_tcp_nagle_disable.attr,
1086         &dev_attr_fnode_tcp_wsf_disable.attr,
1087         &dev_attr_fnode_tcp_timer_scale.attr,
1088         &dev_attr_fnode_tcp_timestamp_enable.attr,
1089         &dev_attr_fnode_fragment_disable.attr,
1090         &dev_attr_fnode_max_recv_dlength.attr,
1091         &dev_attr_fnode_max_xmit_dlength.attr,
1092         &dev_attr_fnode_keepalive_tmo.attr,
1093         &dev_attr_fnode_port.attr,
1094         &dev_attr_fnode_ipaddress.attr,
1095         &dev_attr_fnode_redirect_ipaddr.attr,
1096         &dev_attr_fnode_max_segment_size.attr,
1097         &dev_attr_fnode_local_port.attr,
1098         &dev_attr_fnode_ipv4_tos.attr,
1099         &dev_attr_fnode_ipv6_traffic_class.attr,
1100         &dev_attr_fnode_ipv6_flow_label.attr,
1101         &dev_attr_fnode_link_local_ipv6.attr,
1102         &dev_attr_fnode_tcp_xmit_wsf.attr,
1103         &dev_attr_fnode_tcp_recv_wsf.attr,
1104         &dev_attr_fnode_statsn.attr,
1105         &dev_attr_fnode_exp_statsn.attr,
1106         NULL,
1107 };
1108
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110                                                     struct attribute *attr,
1111                                                     int i)
1112 {
1113         struct device *dev = container_of(kobj, struct device, kobj);
1114         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115         struct iscsi_transport *t = fnode_conn->transport;
1116         int param;
1117
1118         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1121                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1123                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1125                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144         } else if (attr == &dev_attr_fnode_port.attr) {
1145                 param = ISCSI_FLASHNODE_PORT;
1146         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147                 param = ISCSI_FLASHNODE_IPADDR;
1148         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152         } else if (attr == &dev_attr_fnode_local_port.attr) {
1153                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1154         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155                 param = ISCSI_FLASHNODE_IPV4_TOS;
1156         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_TC;
1158         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166         } else if (attr == &dev_attr_fnode_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_STATSN;
1168         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169                 param = ISCSI_FLASHNODE_EXP_STATSN;
1170         } else {
1171                 WARN_ONCE(1, "Invalid flashnode connection attr");
1172                 return 0;
1173         }
1174
1175         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179         .attrs = iscsi_flashnode_conn_attrs,
1180         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184         &iscsi_flashnode_conn_attr_group,
1185         NULL,
1186 };
1187
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192         kfree(fnode_conn->ipaddress);
1193         kfree(fnode_conn->redirect_ipaddr);
1194         kfree(fnode_conn->link_local_ipv6_addr);
1195         kfree(fnode_conn);
1196 }
1197
1198 struct device_type iscsi_flashnode_conn_dev_type = {
1199         .name = "iscsi_flashnode_conn_dev_type",
1200         .groups = iscsi_flashnode_conn_attr_groups,
1201         .release = iscsi_flashnode_conn_release,
1202 };
1203
1204 struct bus_type iscsi_flashnode_bus;
1205
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207                                      struct device_driver *drv)
1208 {
1209         if (dev->bus == &iscsi_flashnode_bus)
1210                 return 1;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215 struct bus_type iscsi_flashnode_bus = {
1216         .name = "iscsi_flashnode",
1217         .match = &iscsi_flashnode_bus_match,
1218 };
1219
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235                             struct iscsi_transport *transport,
1236                             int dd_size)
1237 {
1238         struct iscsi_bus_flash_session *fnode_sess;
1239         int err;
1240
1241         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242         if (!fnode_sess)
1243                 return NULL;
1244
1245         fnode_sess->transport = transport;
1246         fnode_sess->target_id = index;
1247         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249         fnode_sess->dev.parent = &shost->shost_gendev;
1250         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251                      shost->host_no, index);
1252
1253         err = device_register(&fnode_sess->dev);
1254         if (err)
1255                 goto free_fnode_sess;
1256
1257         if (dd_size)
1258                 fnode_sess->dd_data = &fnode_sess[1];
1259
1260         return fnode_sess;
1261
1262 free_fnode_sess:
1263         kfree(fnode_sess);
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283                             struct iscsi_bus_flash_session *fnode_sess,
1284                             struct iscsi_transport *transport,
1285                             int dd_size)
1286 {
1287         struct iscsi_bus_flash_conn *fnode_conn;
1288         int err;
1289
1290         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291         if (!fnode_conn)
1292                 return NULL;
1293
1294         fnode_conn->transport = transport;
1295         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297         fnode_conn->dev.parent = &fnode_sess->dev;
1298         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299                      shost->host_no, fnode_sess->target_id);
1300
1301         err = device_register(&fnode_conn->dev);
1302         if (err)
1303                 goto free_fnode_conn;
1304
1305         if (dd_size)
1306                 fnode_conn->dd_data = &fnode_conn[1];
1307
1308         return fnode_conn;
1309
1310 free_fnode_conn:
1311         kfree(fnode_conn);
1312         return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329         return dev->bus == &iscsi_flashnode_bus;
1330 }
1331 EXPORT_SYMBOL_GPL(iscsi_is_flashnode_conn_dev);
1332
1333 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1334 {
1335         device_unregister(&fnode_conn->dev);
1336         return 0;
1337 }
1338
1339 static int flashnode_match_index(struct device *dev, void *data)
1340 {
1341         struct iscsi_bus_flash_session *fnode_sess = NULL;
1342         int ret = 0;
1343
1344         if (!iscsi_flashnode_bus_match(dev, NULL))
1345                 goto exit_match_index;
1346
1347         fnode_sess = iscsi_dev_to_flash_session(dev);
1348         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1349
1350 exit_match_index:
1351         return ret;
1352 }
1353
1354 /**
1355  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1356  * @shost: pointer to host data
1357  * @idx: index to match
1358  *
1359  * Finds the flashnode session object for the passed index
1360  *
1361  * Returns:
1362  *  pointer to found flashnode session object on success
1363  *  %NULL on failure
1364  */
1365 static struct iscsi_bus_flash_session *
1366 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1367 {
1368         struct iscsi_bus_flash_session *fnode_sess = NULL;
1369         struct device *dev;
1370
1371         dev = device_find_child(&shost->shost_gendev, &idx,
1372                                 flashnode_match_index);
1373         if (dev)
1374                 fnode_sess = iscsi_dev_to_flash_session(dev);
1375
1376         return fnode_sess;
1377 }
1378
1379 /**
1380  * iscsi_find_flashnode_sess - finds flashnode session entry
1381  * @shost: pointer to host data
1382  * @data: pointer to data containing value to use for comparison
1383  * @fn: function pointer that does actual comparison
1384  *
1385  * Finds the flashnode session object comparing the data passed using logic
1386  * defined in passed function pointer
1387  *
1388  * Returns:
1389  *  pointer to found flashnode session device object on success
1390  *  %NULL on failure
1391  */
1392 struct device *
1393 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1394                           int (*fn)(struct device *dev, void *data))
1395 {
1396         return device_find_child(&shost->shost_gendev, data, fn);
1397 }
1398 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1399
1400 /**
1401  * iscsi_find_flashnode_conn - finds flashnode connection entry
1402  * @fnode_sess: pointer to parent flashnode session entry
1403  *
1404  * Finds the flashnode connection object comparing the data passed using logic
1405  * defined in passed function pointer
1406  *
1407  * Returns:
1408  *  pointer to found flashnode connection device object on success
1409  *  %NULL on failure
1410  */
1411 struct device *
1412 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1413 {
1414         return device_find_child(&fnode_sess->dev, NULL,
1415                                  iscsi_is_flashnode_conn_dev);
1416 }
1417 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1418
1419 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1420 {
1421         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1422                 return 0;
1423
1424         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1425 }
1426
1427 /**
1428  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1429  * @fnode_sess: pointer to flashnode session entry to be destroyed
1430  *
1431  * Deletes the flashnode session entry and all children flashnode connection
1432  * entries from sysfs
1433  */
1434 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1435 {
1436         int err;
1437
1438         err = device_for_each_child(&fnode_sess->dev, NULL,
1439                                     iscsi_iter_destroy_flashnode_conn_fn);
1440         if (err)
1441                 pr_err("Could not delete all connections for %s. Error %d.\n",
1442                        fnode_sess->dev.kobj.name, err);
1443
1444         device_unregister(&fnode_sess->dev);
1445 }
1446 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1447
1448 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1449 {
1450         if (!iscsi_flashnode_bus_match(dev, NULL))
1451                 return 0;
1452
1453         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1454         return 0;
1455 }
1456
1457 /**
1458  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1459  * @shost: pointer to host data
1460  *
1461  * Destroys all the flashnode session entries and all corresponding children
1462  * flashnode connection entries from sysfs
1463  */
1464 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1465 {
1466         device_for_each_child(&shost->shost_gendev, NULL,
1467                               iscsi_iter_destroy_flashnode_fn);
1468 }
1469 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1470
1471 /*
1472  * BSG support
1473  */
1474 /**
1475  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1476  * @job: bsg job to be processed
1477  */
1478 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1479 {
1480         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1481         struct iscsi_bsg_request *req = job->request;
1482         struct iscsi_bsg_reply *reply = job->reply;
1483         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1484         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1485         int ret;
1486
1487         /* check if we have the msgcode value at least */
1488         if (job->request_len < sizeof(uint32_t)) {
1489                 ret = -ENOMSG;
1490                 goto fail_host_msg;
1491         }
1492
1493         /* Validate the host command */
1494         switch (req->msgcode) {
1495         case ISCSI_BSG_HST_VENDOR:
1496                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1497                 if ((shost->hostt->vendor_id == 0L) ||
1498                     (req->rqst_data.h_vendor.vendor_id !=
1499                         shost->hostt->vendor_id)) {
1500                         ret = -ESRCH;
1501                         goto fail_host_msg;
1502                 }
1503                 break;
1504         default:
1505                 ret = -EBADR;
1506                 goto fail_host_msg;
1507         }
1508
1509         /* check if we really have all the request data needed */
1510         if (job->request_len < cmdlen) {
1511                 ret = -ENOMSG;
1512                 goto fail_host_msg;
1513         }
1514
1515         ret = i->iscsi_transport->bsg_request(job);
1516         if (!ret)
1517                 return 0;
1518
1519 fail_host_msg:
1520         /* return the errno failure code as the only status */
1521         BUG_ON(job->reply_len < sizeof(uint32_t));
1522         reply->reply_payload_rcv_len = 0;
1523         reply->result = ret;
1524         job->reply_len = sizeof(uint32_t);
1525         bsg_job_done(job, ret, 0);
1526         return 0;
1527 }
1528
1529 /**
1530  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1531  * @shost: shost for iscsi_host
1532  * @ihost: iscsi_cls_host adding the structures to
1533  */
1534 static int
1535 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1536 {
1537         struct device *dev = &shost->shost_gendev;
1538         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1539         struct request_queue *q;
1540         char bsg_name[20];
1541         int ret;
1542
1543         if (!i->iscsi_transport->bsg_request)
1544                 return -ENOTSUPP;
1545
1546         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1547
1548         q = __scsi_alloc_queue(shost, bsg_request_fn);
1549         if (!q)
1550                 return -ENOMEM;
1551
1552         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
1553         if (ret) {
1554                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1555                              "initialize - no request queue\n");
1556                 blk_cleanup_queue(q);
1557                 return ret;
1558         }
1559
1560         ihost->bsg_q = q;
1561         return 0;
1562 }
1563
1564 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1565                             struct device *cdev)
1566 {
1567         struct Scsi_Host *shost = dev_to_shost(dev);
1568         struct iscsi_cls_host *ihost = shost->shost_data;
1569
1570         memset(ihost, 0, sizeof(*ihost));
1571         atomic_set(&ihost->nr_scans, 0);
1572         mutex_init(&ihost->mutex);
1573
1574         iscsi_bsg_host_add(shost, ihost);
1575         /* ignore any bsg add error - we just can't do sgio */
1576
1577         return 0;
1578 }
1579
1580 static int iscsi_remove_host(struct transport_container *tc,
1581                              struct device *dev, struct device *cdev)
1582 {
1583         struct Scsi_Host *shost = dev_to_shost(dev);
1584         struct iscsi_cls_host *ihost = shost->shost_data;
1585
1586         if (ihost->bsg_q) {
1587                 bsg_unregister_queue(ihost->bsg_q);
1588                 blk_cleanup_queue(ihost->bsg_q);
1589         }
1590         return 0;
1591 }
1592
1593 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1594                                "iscsi_host",
1595                                iscsi_setup_host,
1596                                iscsi_remove_host,
1597                                NULL);
1598
1599 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1600                                "iscsi_session",
1601                                NULL,
1602                                NULL,
1603                                NULL);
1604
1605 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1606                                "iscsi_connection",
1607                                NULL,
1608                                NULL,
1609                                NULL);
1610
1611 static struct sock *nls;
1612 static DEFINE_MUTEX(rx_queue_mutex);
1613
1614 static LIST_HEAD(sesslist);
1615 static DEFINE_SPINLOCK(sesslock);
1616 static LIST_HEAD(connlist);
1617 static DEFINE_SPINLOCK(connlock);
1618
1619 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1620 {
1621         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1622         return sess->sid;
1623 }
1624
1625 /*
1626  * Returns the matching session to a given sid
1627  */
1628 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1629 {
1630         unsigned long flags;
1631         struct iscsi_cls_session *sess;
1632
1633         spin_lock_irqsave(&sesslock, flags);
1634         list_for_each_entry(sess, &sesslist, sess_list) {
1635                 if (sess->sid == sid) {
1636                         spin_unlock_irqrestore(&sesslock, flags);
1637                         return sess;
1638                 }
1639         }
1640         spin_unlock_irqrestore(&sesslock, flags);
1641         return NULL;
1642 }
1643
1644 /*
1645  * Returns the matching connection to a given sid / cid tuple
1646  */
1647 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1648 {
1649         unsigned long flags;
1650         struct iscsi_cls_conn *conn;
1651
1652         spin_lock_irqsave(&connlock, flags);
1653         list_for_each_entry(conn, &connlist, conn_list) {
1654                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1655                         spin_unlock_irqrestore(&connlock, flags);
1656                         return conn;
1657                 }
1658         }
1659         spin_unlock_irqrestore(&connlock, flags);
1660         return NULL;
1661 }
1662
1663 /*
1664  * The following functions can be used by LLDs that allocate
1665  * their own scsi_hosts or by software iscsi LLDs
1666  */
1667 static struct {
1668         int value;
1669         char *name;
1670 } iscsi_session_state_names[] = {
1671         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1672         { ISCSI_SESSION_FAILED,         "FAILED" },
1673         { ISCSI_SESSION_FREE,           "FREE" },
1674 };
1675
1676 static const char *iscsi_session_state_name(int state)
1677 {
1678         int i;
1679         char *name = NULL;
1680
1681         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1682                 if (iscsi_session_state_names[i].value == state) {
1683                         name = iscsi_session_state_names[i].name;
1684                         break;
1685                 }
1686         }
1687         return name;
1688 }
1689
1690 int iscsi_session_chkready(struct iscsi_cls_session *session)
1691 {
1692         unsigned long flags;
1693         int err;
1694
1695         spin_lock_irqsave(&session->lock, flags);
1696         switch (session->state) {
1697         case ISCSI_SESSION_LOGGED_IN:
1698                 err = 0;
1699                 break;
1700         case ISCSI_SESSION_FAILED:
1701                 err = DID_IMM_RETRY << 16;
1702                 break;
1703         case ISCSI_SESSION_FREE:
1704                 err = DID_TRANSPORT_FAILFAST << 16;
1705                 break;
1706         default:
1707                 err = DID_NO_CONNECT << 16;
1708                 break;
1709         }
1710         spin_unlock_irqrestore(&session->lock, flags);
1711         return err;
1712 }
1713 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1714
1715 int iscsi_is_session_online(struct iscsi_cls_session *session)
1716 {
1717         unsigned long flags;
1718         int ret = 0;
1719
1720         spin_lock_irqsave(&session->lock, flags);
1721         if (session->state == ISCSI_SESSION_LOGGED_IN)
1722                 ret = 1;
1723         spin_unlock_irqrestore(&session->lock, flags);
1724         return ret;
1725 }
1726 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1727
1728 static void iscsi_session_release(struct device *dev)
1729 {
1730         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1731         struct Scsi_Host *shost;
1732
1733         shost = iscsi_session_to_shost(session);
1734         scsi_host_put(shost);
1735         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1736         kfree(session);
1737 }
1738
1739 int iscsi_is_session_dev(const struct device *dev)
1740 {
1741         return dev->release == iscsi_session_release;
1742 }
1743 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1744
1745 static int iscsi_iter_session_fn(struct device *dev, void *data)
1746 {
1747         void (* fn) (struct iscsi_cls_session *) = data;
1748
1749         if (!iscsi_is_session_dev(dev))
1750                 return 0;
1751         fn(iscsi_dev_to_session(dev));
1752         return 0;
1753 }
1754
1755 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1756                                  void (*fn)(struct iscsi_cls_session *))
1757 {
1758         device_for_each_child(&shost->shost_gendev, fn,
1759                               iscsi_iter_session_fn);
1760 }
1761 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1762
1763 /**
1764  * iscsi_scan_finished - helper to report when running scans are done
1765  * @shost: scsi host
1766  * @time: scan run time
1767  *
1768  * This function can be used by drives like qla4xxx to report to the scsi
1769  * layer when the scans it kicked off at module load time are done.
1770  */
1771 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1772 {
1773         struct iscsi_cls_host *ihost = shost->shost_data;
1774         /*
1775          * qla4xxx will have kicked off some session unblocks before calling
1776          * scsi_scan_host, so just wait for them to complete.
1777          */
1778         return !atomic_read(&ihost->nr_scans);
1779 }
1780 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1781
1782 struct iscsi_scan_data {
1783         unsigned int channel;
1784         unsigned int id;
1785         u64 lun;
1786 };
1787
1788 static int iscsi_user_scan_session(struct device *dev, void *data)
1789 {
1790         struct iscsi_scan_data *scan_data = data;
1791         struct iscsi_cls_session *session;
1792         struct Scsi_Host *shost;
1793         struct iscsi_cls_host *ihost;
1794         unsigned long flags;
1795         unsigned int id;
1796
1797         if (!iscsi_is_session_dev(dev))
1798                 return 0;
1799
1800         session = iscsi_dev_to_session(dev);
1801
1802         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1803
1804         shost = iscsi_session_to_shost(session);
1805         ihost = shost->shost_data;
1806
1807         mutex_lock(&ihost->mutex);
1808         spin_lock_irqsave(&session->lock, flags);
1809         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1810                 spin_unlock_irqrestore(&session->lock, flags);
1811                 goto user_scan_exit;
1812         }
1813         id = session->target_id;
1814         spin_unlock_irqrestore(&session->lock, flags);
1815
1816         if (id != ISCSI_MAX_TARGET) {
1817                 if ((scan_data->channel == SCAN_WILD_CARD ||
1818                      scan_data->channel == 0) &&
1819                     (scan_data->id == SCAN_WILD_CARD ||
1820                      scan_data->id == id))
1821                         scsi_scan_target(&session->dev, 0, id,
1822                                          scan_data->lun, 1);
1823         }
1824
1825 user_scan_exit:
1826         mutex_unlock(&ihost->mutex);
1827         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1828         return 0;
1829 }
1830
1831 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1832                            uint id, u64 lun)
1833 {
1834         struct iscsi_scan_data scan_data;
1835
1836         scan_data.channel = channel;
1837         scan_data.id = id;
1838         scan_data.lun = lun;
1839
1840         return device_for_each_child(&shost->shost_gendev, &scan_data,
1841                                      iscsi_user_scan_session);
1842 }
1843
1844 static void iscsi_scan_session(struct work_struct *work)
1845 {
1846         struct iscsi_cls_session *session =
1847                         container_of(work, struct iscsi_cls_session, scan_work);
1848         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1849         struct iscsi_cls_host *ihost = shost->shost_data;
1850         struct iscsi_scan_data scan_data;
1851
1852         scan_data.channel = 0;
1853         scan_data.id = SCAN_WILD_CARD;
1854         scan_data.lun = SCAN_WILD_CARD;
1855
1856         iscsi_user_scan_session(&session->dev, &scan_data);
1857         atomic_dec(&ihost->nr_scans);
1858 }
1859
1860 /**
1861  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1862  * @cmd: scsi cmd passed to scsi eh handler
1863  *
1864  * If the session is down this function will wait for the recovery
1865  * timer to fire or for the session to be logged back in. If the
1866  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1867  * should pass this error value to the scsi eh.
1868  */
1869 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1870 {
1871         struct iscsi_cls_session *session =
1872                         starget_to_session(scsi_target(cmd->device));
1873         unsigned long flags;
1874         int ret = 0;
1875
1876         spin_lock_irqsave(&session->lock, flags);
1877         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1878                 if (session->state == ISCSI_SESSION_FREE) {
1879                         ret = FAST_IO_FAIL;
1880                         break;
1881                 }
1882                 spin_unlock_irqrestore(&session->lock, flags);
1883                 msleep(1000);
1884                 spin_lock_irqsave(&session->lock, flags);
1885         }
1886         spin_unlock_irqrestore(&session->lock, flags);
1887         return ret;
1888 }
1889 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1890
1891 static void session_recovery_timedout(struct work_struct *work)
1892 {
1893         struct iscsi_cls_session *session =
1894                 container_of(work, struct iscsi_cls_session,
1895                              recovery_work.work);
1896         unsigned long flags;
1897
1898         iscsi_cls_session_printk(KERN_INFO, session,
1899                                  "session recovery timed out after %d secs\n",
1900                                  session->recovery_tmo);
1901
1902         spin_lock_irqsave(&session->lock, flags);
1903         switch (session->state) {
1904         case ISCSI_SESSION_FAILED:
1905                 session->state = ISCSI_SESSION_FREE;
1906                 break;
1907         case ISCSI_SESSION_LOGGED_IN:
1908         case ISCSI_SESSION_FREE:
1909                 /* we raced with the unblock's flush */
1910                 spin_unlock_irqrestore(&session->lock, flags);
1911                 return;
1912         }
1913         spin_unlock_irqrestore(&session->lock, flags);
1914
1915         if (session->transport->session_recovery_timedout)
1916                 session->transport->session_recovery_timedout(session);
1917
1918         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1919         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1920         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1921 }
1922
1923 static void __iscsi_unblock_session(struct work_struct *work)
1924 {
1925         struct iscsi_cls_session *session =
1926                         container_of(work, struct iscsi_cls_session,
1927                                      unblock_work);
1928         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1929         struct iscsi_cls_host *ihost = shost->shost_data;
1930         unsigned long flags;
1931
1932         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1933         /*
1934          * The recovery and unblock work get run from the same workqueue,
1935          * so try to cancel it if it was going to run after this unblock.
1936          */
1937         cancel_delayed_work(&session->recovery_work);
1938         spin_lock_irqsave(&session->lock, flags);
1939         session->state = ISCSI_SESSION_LOGGED_IN;
1940         spin_unlock_irqrestore(&session->lock, flags);
1941         /* start IO */
1942         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1943         /*
1944          * Only do kernel scanning if the driver is properly hooked into
1945          * the async scanning code (drivers like iscsi_tcp do login and
1946          * scanning from userspace).
1947          */
1948         if (shost->hostt->scan_finished) {
1949                 if (scsi_queue_work(shost, &session->scan_work))
1950                         atomic_inc(&ihost->nr_scans);
1951         }
1952         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1953 }
1954
1955 /**
1956  * iscsi_unblock_session - set a session as logged in and start IO.
1957  * @session: iscsi session
1958  *
1959  * Mark a session as ready to accept IO.
1960  */
1961 void iscsi_unblock_session(struct iscsi_cls_session *session)
1962 {
1963         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1964         /*
1965          * make sure all the events have completed before tell the driver
1966          * it is safe
1967          */
1968         flush_workqueue(iscsi_eh_timer_workq);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1971
1972 static void __iscsi_block_session(struct work_struct *work)
1973 {
1974         struct iscsi_cls_session *session =
1975                         container_of(work, struct iscsi_cls_session,
1976                                      block_work);
1977         unsigned long flags;
1978
1979         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1980         spin_lock_irqsave(&session->lock, flags);
1981         session->state = ISCSI_SESSION_FAILED;
1982         spin_unlock_irqrestore(&session->lock, flags);
1983         scsi_target_block(&session->dev);
1984         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1985         if (session->recovery_tmo >= 0)
1986                 queue_delayed_work(iscsi_eh_timer_workq,
1987                                    &session->recovery_work,
1988                                    session->recovery_tmo * HZ);
1989 }
1990
1991 void iscsi_block_session(struct iscsi_cls_session *session)
1992 {
1993         queue_work(iscsi_eh_timer_workq, &session->block_work);
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_block_session);
1996
1997 static void __iscsi_unbind_session(struct work_struct *work)
1998 {
1999         struct iscsi_cls_session *session =
2000                         container_of(work, struct iscsi_cls_session,
2001                                      unbind_work);
2002         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2003         struct iscsi_cls_host *ihost = shost->shost_data;
2004         unsigned long flags;
2005         unsigned int target_id;
2006
2007         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2008
2009         /* Prevent new scans and make sure scanning is not in progress */
2010         mutex_lock(&ihost->mutex);
2011         spin_lock_irqsave(&session->lock, flags);
2012         if (session->target_id == ISCSI_MAX_TARGET) {
2013                 spin_unlock_irqrestore(&session->lock, flags);
2014                 mutex_unlock(&ihost->mutex);
2015                 return;
2016         }
2017
2018         target_id = session->target_id;
2019         session->target_id = ISCSI_MAX_TARGET;
2020         spin_unlock_irqrestore(&session->lock, flags);
2021         mutex_unlock(&ihost->mutex);
2022
2023         if (session->ida_used)
2024                 ida_simple_remove(&iscsi_sess_ida, target_id);
2025
2026         scsi_remove_target(&session->dev);
2027         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2028         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2029 }
2030
2031 struct iscsi_cls_session *
2032 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2033                     int dd_size)
2034 {
2035         struct iscsi_cls_session *session;
2036
2037         session = kzalloc(sizeof(*session) + dd_size,
2038                           GFP_KERNEL);
2039         if (!session)
2040                 return NULL;
2041
2042         session->transport = transport;
2043         session->creator = -1;
2044         session->recovery_tmo = 120;
2045         session->recovery_tmo_sysfs_override = false;
2046         session->state = ISCSI_SESSION_FREE;
2047         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2048         INIT_LIST_HEAD(&session->sess_list);
2049         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2050         INIT_WORK(&session->block_work, __iscsi_block_session);
2051         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2052         INIT_WORK(&session->scan_work, iscsi_scan_session);
2053         spin_lock_init(&session->lock);
2054
2055         /* this is released in the dev's release function */
2056         scsi_host_get(shost);
2057         session->dev.parent = &shost->shost_gendev;
2058         session->dev.release = iscsi_session_release;
2059         device_initialize(&session->dev);
2060         if (dd_size)
2061                 session->dd_data = &session[1];
2062
2063         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2064         return session;
2065 }
2066 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2067
2068 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2069 {
2070         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2071         struct iscsi_cls_host *ihost;
2072         unsigned long flags;
2073         int id = 0;
2074         int err;
2075
2076         ihost = shost->shost_data;
2077         session->sid = atomic_add_return(1, &iscsi_session_nr);
2078
2079         if (target_id == ISCSI_MAX_TARGET) {
2080                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2081
2082                 if (id < 0) {
2083                         iscsi_cls_session_printk(KERN_ERR, session,
2084                                         "Failure in Target ID Allocation\n");
2085                         return id;
2086                 }
2087                 session->target_id = (unsigned int)id;
2088                 session->ida_used = true;
2089         } else
2090                 session->target_id = target_id;
2091
2092         dev_set_name(&session->dev, "session%u", session->sid);
2093         err = device_add(&session->dev);
2094         if (err) {
2095                 iscsi_cls_session_printk(KERN_ERR, session,
2096                                          "could not register session's dev\n");
2097                 goto release_ida;
2098         }
2099         transport_register_device(&session->dev);
2100
2101         spin_lock_irqsave(&sesslock, flags);
2102         list_add(&session->sess_list, &sesslist);
2103         spin_unlock_irqrestore(&sesslock, flags);
2104
2105         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2106         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2107         return 0;
2108
2109 release_ida:
2110         if (session->ida_used)
2111                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2112
2113         return err;
2114 }
2115 EXPORT_SYMBOL_GPL(iscsi_add_session);
2116
2117 /**
2118  * iscsi_create_session - create iscsi class session
2119  * @shost: scsi host
2120  * @transport: iscsi transport
2121  * @dd_size: private driver data size
2122  * @target_id: which target
2123  *
2124  * This can be called from a LLD or iscsi_transport.
2125  */
2126 struct iscsi_cls_session *
2127 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2128                      int dd_size, unsigned int target_id)
2129 {
2130         struct iscsi_cls_session *session;
2131
2132         session = iscsi_alloc_session(shost, transport, dd_size);
2133         if (!session)
2134                 return NULL;
2135
2136         if (iscsi_add_session(session, target_id)) {
2137                 iscsi_free_session(session);
2138                 return NULL;
2139         }
2140         return session;
2141 }
2142 EXPORT_SYMBOL_GPL(iscsi_create_session);
2143
2144 static void iscsi_conn_release(struct device *dev)
2145 {
2146         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2147         struct device *parent = conn->dev.parent;
2148
2149         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2150         kfree(conn);
2151         put_device(parent);
2152 }
2153
2154 static int iscsi_is_conn_dev(const struct device *dev)
2155 {
2156         return dev->release == iscsi_conn_release;
2157 }
2158
2159 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2160 {
2161         if (!iscsi_is_conn_dev(dev))
2162                 return 0;
2163         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2164 }
2165
2166 void iscsi_remove_session(struct iscsi_cls_session *session)
2167 {
2168         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2169         unsigned long flags;
2170         int err;
2171
2172         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2173
2174         spin_lock_irqsave(&sesslock, flags);
2175         list_del(&session->sess_list);
2176         spin_unlock_irqrestore(&sesslock, flags);
2177
2178         /* make sure there are no blocks/unblocks queued */
2179         flush_workqueue(iscsi_eh_timer_workq);
2180         /* make sure the timedout callout is not running */
2181         if (!cancel_delayed_work(&session->recovery_work))
2182                 flush_workqueue(iscsi_eh_timer_workq);
2183         /*
2184          * If we are blocked let commands flow again. The lld or iscsi
2185          * layer should set up the queuecommand to fail commands.
2186          * We assume that LLD will not be calling block/unblock while
2187          * removing the session.
2188          */
2189         spin_lock_irqsave(&session->lock, flags);
2190         session->state = ISCSI_SESSION_FREE;
2191         spin_unlock_irqrestore(&session->lock, flags);
2192
2193         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2194         /* flush running scans then delete devices */
2195         scsi_flush_work(shost);
2196         __iscsi_unbind_session(&session->unbind_work);
2197
2198         /* hw iscsi may not have removed all connections from session */
2199         err = device_for_each_child(&session->dev, NULL,
2200                                     iscsi_iter_destroy_conn_fn);
2201         if (err)
2202                 iscsi_cls_session_printk(KERN_ERR, session,
2203                                          "Could not delete all connections "
2204                                          "for session. Error %d.\n", err);
2205
2206         transport_unregister_device(&session->dev);
2207
2208         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2209         device_del(&session->dev);
2210 }
2211 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2212
2213 void iscsi_free_session(struct iscsi_cls_session *session)
2214 {
2215         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2216         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2217         put_device(&session->dev);
2218 }
2219 EXPORT_SYMBOL_GPL(iscsi_free_session);
2220
2221 /**
2222  * iscsi_destroy_session - destroy iscsi session
2223  * @session: iscsi_session
2224  *
2225  * Can be called by a LLD or iscsi_transport. There must not be
2226  * any running connections.
2227  */
2228 int iscsi_destroy_session(struct iscsi_cls_session *session)
2229 {
2230         iscsi_remove_session(session);
2231         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
2232         iscsi_free_session(session);
2233         return 0;
2234 }
2235 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
2236
2237 /**
2238  * iscsi_create_conn - create iscsi class connection
2239  * @session: iscsi cls session
2240  * @dd_size: private driver data size
2241  * @cid: connection id
2242  *
2243  * This can be called from a LLD or iscsi_transport. The connection
2244  * is child of the session so cid must be unique for all connections
2245  * on the session.
2246  *
2247  * Since we do not support MCS, cid will normally be zero. In some cases
2248  * for software iscsi we could be trying to preallocate a connection struct
2249  * in which case there could be two connection structs and cid would be
2250  * non-zero.
2251  */
2252 struct iscsi_cls_conn *
2253 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2254 {
2255         struct iscsi_transport *transport = session->transport;
2256         struct iscsi_cls_conn *conn;
2257         unsigned long flags;
2258         int err;
2259
2260         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2261         if (!conn)
2262                 return NULL;
2263         if (dd_size)
2264                 conn->dd_data = &conn[1];
2265
2266         mutex_init(&conn->ep_mutex);
2267         INIT_LIST_HEAD(&conn->conn_list);
2268         conn->transport = transport;
2269         conn->cid = cid;
2270
2271         /* this is released in the dev's release function */
2272         if (!get_device(&session->dev))
2273                 goto free_conn;
2274
2275         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2276         conn->dev.parent = &session->dev;
2277         conn->dev.release = iscsi_conn_release;
2278         err = device_register(&conn->dev);
2279         if (err) {
2280                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2281                                          "register connection's dev\n");
2282                 goto release_parent_ref;
2283         }
2284         transport_register_device(&conn->dev);
2285
2286         spin_lock_irqsave(&connlock, flags);
2287         list_add(&conn->conn_list, &connlist);
2288         spin_unlock_irqrestore(&connlock, flags);
2289
2290         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2291         return conn;
2292
2293 release_parent_ref:
2294         put_device(&session->dev);
2295 free_conn:
2296         kfree(conn);
2297         return NULL;
2298 }
2299
2300 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2301
2302 /**
2303  * iscsi_destroy_conn - destroy iscsi class connection
2304  * @conn: iscsi cls session
2305  *
2306  * This can be called from a LLD or iscsi_transport.
2307  */
2308 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2309 {
2310         unsigned long flags;
2311
2312         spin_lock_irqsave(&connlock, flags);
2313         list_del(&conn->conn_list);
2314         spin_unlock_irqrestore(&connlock, flags);
2315
2316         transport_unregister_device(&conn->dev);
2317         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2318         device_unregister(&conn->dev);
2319         return 0;
2320 }
2321 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2322
2323 /*
2324  * iscsi interface functions
2325  */
2326 static struct iscsi_internal *
2327 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2328 {
2329         struct iscsi_internal *priv;
2330         unsigned long flags;
2331
2332         spin_lock_irqsave(&iscsi_transport_lock, flags);
2333         list_for_each_entry(priv, &iscsi_transports, list) {
2334                 if (tt == priv->iscsi_transport) {
2335                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2336                         return priv;
2337                 }
2338         }
2339         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2340         return NULL;
2341 }
2342
2343 static int
2344 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2345 {
2346         return nlmsg_multicast(nls, skb, 0, group, gfp);
2347 }
2348
2349 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2350                    char *data, uint32_t data_size)
2351 {
2352         struct nlmsghdr *nlh;
2353         struct sk_buff *skb;
2354         struct iscsi_uevent *ev;
2355         char *pdu;
2356         struct iscsi_internal *priv;
2357         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2358                                    data_size);
2359
2360         priv = iscsi_if_transport_lookup(conn->transport);
2361         if (!priv)
2362                 return -EINVAL;
2363
2364         skb = alloc_skb(len, GFP_ATOMIC);
2365         if (!skb) {
2366                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2367                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2368                                       "control PDU: OOM\n");
2369                 return -ENOMEM;
2370         }
2371
2372         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2373         ev = nlmsg_data(nlh);
2374         memset(ev, 0, sizeof(*ev));
2375         ev->transport_handle = iscsi_handle(conn->transport);
2376         ev->type = ISCSI_KEVENT_RECV_PDU;
2377         ev->r.recv_req.cid = conn->cid;
2378         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2379         pdu = (char*)ev + sizeof(*ev);
2380         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2381         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2382
2383         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2384 }
2385 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2386
2387 int iscsi_offload_mesg(struct Scsi_Host *shost,
2388                        struct iscsi_transport *transport, uint32_t type,
2389                        char *data, uint16_t data_size)
2390 {
2391         struct nlmsghdr *nlh;
2392         struct sk_buff *skb;
2393         struct iscsi_uevent *ev;
2394         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2395
2396         skb = alloc_skb(len, GFP_ATOMIC);
2397         if (!skb) {
2398                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2399                 return -ENOMEM;
2400         }
2401
2402         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2403         ev = nlmsg_data(nlh);
2404         memset(ev, 0, sizeof(*ev));
2405         ev->type = type;
2406         ev->transport_handle = iscsi_handle(transport);
2407         switch (type) {
2408         case ISCSI_KEVENT_PATH_REQ:
2409                 ev->r.req_path.host_no = shost->host_no;
2410                 break;
2411         case ISCSI_KEVENT_IF_DOWN:
2412                 ev->r.notify_if_down.host_no = shost->host_no;
2413                 break;
2414         }
2415
2416         memcpy((char *)ev + sizeof(*ev), data, data_size);
2417
2418         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2419 }
2420 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2421
2422 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2423 {
2424         struct nlmsghdr *nlh;
2425         struct sk_buff  *skb;
2426         struct iscsi_uevent *ev;
2427         struct iscsi_internal *priv;
2428         int len = nlmsg_total_size(sizeof(*ev));
2429
2430         priv = iscsi_if_transport_lookup(conn->transport);
2431         if (!priv)
2432                 return;
2433
2434         skb = alloc_skb(len, GFP_ATOMIC);
2435         if (!skb) {
2436                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2437                                       "conn error (%d)\n", error);
2438                 return;
2439         }
2440
2441         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2442         ev = nlmsg_data(nlh);
2443         ev->transport_handle = iscsi_handle(conn->transport);
2444         ev->type = ISCSI_KEVENT_CONN_ERROR;
2445         ev->r.connerror.error = error;
2446         ev->r.connerror.cid = conn->cid;
2447         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2448
2449         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2450
2451         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2452                               error);
2453 }
2454 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2455
2456 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2457                             enum iscsi_conn_state state)
2458 {
2459         struct nlmsghdr *nlh;
2460         struct sk_buff  *skb;
2461         struct iscsi_uevent *ev;
2462         struct iscsi_internal *priv;
2463         int len = nlmsg_total_size(sizeof(*ev));
2464
2465         priv = iscsi_if_transport_lookup(conn->transport);
2466         if (!priv)
2467                 return;
2468
2469         skb = alloc_skb(len, GFP_ATOMIC);
2470         if (!skb) {
2471                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2472                                       "conn login (%d)\n", state);
2473                 return;
2474         }
2475
2476         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2477         ev = nlmsg_data(nlh);
2478         ev->transport_handle = iscsi_handle(conn->transport);
2479         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2480         ev->r.conn_login.state = state;
2481         ev->r.conn_login.cid = conn->cid;
2482         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2483         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2484
2485         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2486                               state);
2487 }
2488 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2489
2490 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2491                            enum iscsi_host_event_code code, uint32_t data_size,
2492                            uint8_t *data)
2493 {
2494         struct nlmsghdr *nlh;
2495         struct sk_buff *skb;
2496         struct iscsi_uevent *ev;
2497         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2498
2499         skb = alloc_skb(len, GFP_NOIO);
2500         if (!skb) {
2501                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2502                        host_no, code);
2503                 return;
2504         }
2505
2506         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2507         ev = nlmsg_data(nlh);
2508         ev->transport_handle = iscsi_handle(transport);
2509         ev->type = ISCSI_KEVENT_HOST_EVENT;
2510         ev->r.host_event.host_no = host_no;
2511         ev->r.host_event.code = code;
2512         ev->r.host_event.data_size = data_size;
2513
2514         if (data_size)
2515                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2516
2517         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2518 }
2519 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2520
2521 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2522                            uint32_t status, uint32_t pid, uint32_t data_size,
2523                            uint8_t *data)
2524 {
2525         struct nlmsghdr *nlh;
2526         struct sk_buff *skb;
2527         struct iscsi_uevent *ev;
2528         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2529
2530         skb = alloc_skb(len, GFP_NOIO);
2531         if (!skb) {
2532                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2533                 return;
2534         }
2535
2536         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2537         ev = nlmsg_data(nlh);
2538         ev->transport_handle = iscsi_handle(transport);
2539         ev->type = ISCSI_KEVENT_PING_COMP;
2540         ev->r.ping_comp.host_no = host_no;
2541         ev->r.ping_comp.status = status;
2542         ev->r.ping_comp.pid = pid;
2543         ev->r.ping_comp.data_size = data_size;
2544         memcpy((char *)ev + sizeof(*ev), data, data_size);
2545
2546         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2547 }
2548 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2549
2550 static int
2551 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2552                     void *payload, int size)
2553 {
2554         struct sk_buff  *skb;
2555         struct nlmsghdr *nlh;
2556         int len = nlmsg_total_size(size);
2557         int flags = multi ? NLM_F_MULTI : 0;
2558         int t = done ? NLMSG_DONE : type;
2559
2560         skb = alloc_skb(len, GFP_ATOMIC);
2561         if (!skb) {
2562                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2563                 return -ENOMEM;
2564         }
2565
2566         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2567         nlh->nlmsg_flags = flags;
2568         memcpy(nlmsg_data(nlh), payload, size);
2569         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2570 }
2571
2572 static int
2573 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2574 {
2575         struct iscsi_uevent *ev = nlmsg_data(nlh);
2576         struct iscsi_stats *stats;
2577         struct sk_buff *skbstat;
2578         struct iscsi_cls_conn *conn;
2579         struct nlmsghdr *nlhstat;
2580         struct iscsi_uevent *evstat;
2581         struct iscsi_internal *priv;
2582         int len = nlmsg_total_size(sizeof(*ev) +
2583                                    sizeof(struct iscsi_stats) +
2584                                    sizeof(struct iscsi_stats_custom) *
2585                                    ISCSI_STATS_CUSTOM_MAX);
2586         int err = 0;
2587
2588         priv = iscsi_if_transport_lookup(transport);
2589         if (!priv)
2590                 return -EINVAL;
2591
2592         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2593         if (!conn)
2594                 return -EEXIST;
2595
2596         do {
2597                 int actual_size;
2598
2599                 skbstat = alloc_skb(len, GFP_ATOMIC);
2600                 if (!skbstat) {
2601                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2602                                               "deliver stats: OOM\n");
2603                         return -ENOMEM;
2604                 }
2605
2606                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2607                                       (len - sizeof(*nlhstat)), 0);
2608                 evstat = nlmsg_data(nlhstat);
2609                 memset(evstat, 0, sizeof(*evstat));
2610                 evstat->transport_handle = iscsi_handle(conn->transport);
2611                 evstat->type = nlh->nlmsg_type;
2612                 evstat->u.get_stats.cid =
2613                         ev->u.get_stats.cid;
2614                 evstat->u.get_stats.sid =
2615                         ev->u.get_stats.sid;
2616                 stats = (struct iscsi_stats *)
2617                         ((char*)evstat + sizeof(*evstat));
2618                 memset(stats, 0, sizeof(*stats));
2619
2620                 transport->get_stats(conn, stats);
2621                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2622                                                sizeof(struct iscsi_stats) +
2623                                                sizeof(struct iscsi_stats_custom) *
2624                                                stats->custom_length);
2625                 actual_size -= sizeof(*nlhstat);
2626                 actual_size = nlmsg_msg_size(actual_size);
2627                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2628                 nlhstat->nlmsg_len = actual_size;
2629
2630                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2631                                           GFP_ATOMIC);
2632         } while (err < 0 && err != -ECONNREFUSED);
2633
2634         return err;
2635 }
2636
2637 /**
2638  * iscsi_session_event - send session destr. completion event
2639  * @session: iscsi class session
2640  * @event: type of event
2641  */
2642 int iscsi_session_event(struct iscsi_cls_session *session,
2643                         enum iscsi_uevent_e event)
2644 {
2645         struct iscsi_internal *priv;
2646         struct Scsi_Host *shost;
2647         struct iscsi_uevent *ev;
2648         struct sk_buff  *skb;
2649         struct nlmsghdr *nlh;
2650         int rc, len = nlmsg_total_size(sizeof(*ev));
2651
2652         priv = iscsi_if_transport_lookup(session->transport);
2653         if (!priv)
2654                 return -EINVAL;
2655         shost = iscsi_session_to_shost(session);
2656
2657         skb = alloc_skb(len, GFP_KERNEL);
2658         if (!skb) {
2659                 iscsi_cls_session_printk(KERN_ERR, session,
2660                                          "Cannot notify userspace of session "
2661                                          "event %u\n", event);
2662                 return -ENOMEM;
2663         }
2664
2665         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2666         ev = nlmsg_data(nlh);
2667         ev->transport_handle = iscsi_handle(session->transport);
2668
2669         ev->type = event;
2670         switch (event) {
2671         case ISCSI_KEVENT_DESTROY_SESSION:
2672                 ev->r.d_session.host_no = shost->host_no;
2673                 ev->r.d_session.sid = session->sid;
2674                 break;
2675         case ISCSI_KEVENT_CREATE_SESSION:
2676                 ev->r.c_session_ret.host_no = shost->host_no;
2677                 ev->r.c_session_ret.sid = session->sid;
2678                 break;
2679         case ISCSI_KEVENT_UNBIND_SESSION:
2680                 ev->r.unbind_session.host_no = shost->host_no;
2681                 ev->r.unbind_session.sid = session->sid;
2682                 break;
2683         default:
2684                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2685                                          "%u.\n", event);
2686                 kfree_skb(skb);
2687                 return -EINVAL;
2688         }
2689
2690         /*
2691          * this will occur if the daemon is not up, so we just warn
2692          * the user and when the daemon is restarted it will handle it
2693          */
2694         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2695         if (rc == -ESRCH)
2696                 iscsi_cls_session_printk(KERN_ERR, session,
2697                                          "Cannot notify userspace of session "
2698                                          "event %u. Check iscsi daemon\n",
2699                                          event);
2700
2701         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2702                                 event, rc);
2703         return rc;
2704 }
2705 EXPORT_SYMBOL_GPL(iscsi_session_event);
2706
2707 static int
2708 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2709                         struct iscsi_uevent *ev, pid_t pid,
2710                         uint32_t initial_cmdsn, uint16_t cmds_max,
2711                         uint16_t queue_depth)
2712 {
2713         struct iscsi_transport *transport = priv->iscsi_transport;
2714         struct iscsi_cls_session *session;
2715         struct Scsi_Host *shost;
2716
2717         session = transport->create_session(ep, cmds_max, queue_depth,
2718                                             initial_cmdsn);
2719         if (!session)
2720                 return -ENOMEM;
2721
2722         session->creator = pid;
2723         shost = iscsi_session_to_shost(session);
2724         ev->r.c_session_ret.host_no = shost->host_no;
2725         ev->r.c_session_ret.sid = session->sid;
2726         ISCSI_DBG_TRANS_SESSION(session,
2727                                 "Completed creating transport session\n");
2728         return 0;
2729 }
2730
2731 static int
2732 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2733 {
2734         struct iscsi_cls_conn *conn;
2735         struct iscsi_cls_session *session;
2736
2737         session = iscsi_session_lookup(ev->u.c_conn.sid);
2738         if (!session) {
2739                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2740                        ev->u.c_conn.sid);
2741                 return -EINVAL;
2742         }
2743
2744         conn = transport->create_conn(session, ev->u.c_conn.cid);
2745         if (!conn) {
2746                 iscsi_cls_session_printk(KERN_ERR, session,
2747                                          "couldn't create a new connection.");
2748                 return -ENOMEM;
2749         }
2750
2751         ev->r.c_conn_ret.sid = session->sid;
2752         ev->r.c_conn_ret.cid = conn->cid;
2753
2754         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2755         return 0;
2756 }
2757
2758 static int
2759 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2760 {
2761         struct iscsi_cls_conn *conn;
2762
2763         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2764         if (!conn)
2765                 return -EINVAL;
2766
2767         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2768         if (transport->destroy_conn)
2769                 transport->destroy_conn(conn);
2770
2771         return 0;
2772 }
2773
2774 static int
2775 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2776 {
2777         char *data = (char*)ev + sizeof(*ev);
2778         struct iscsi_cls_conn *conn;
2779         struct iscsi_cls_session *session;
2780         int err = 0, value = 0;
2781
2782         session = iscsi_session_lookup(ev->u.set_param.sid);
2783         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2784         if (!conn || !session)
2785                 return -EINVAL;
2786
2787         switch (ev->u.set_param.param) {
2788         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2789                 sscanf(data, "%d", &value);
2790                 if (!session->recovery_tmo_sysfs_override)
2791                         session->recovery_tmo = value;
2792                 break;
2793         default:
2794                 err = transport->set_param(conn, ev->u.set_param.param,
2795                                            data, ev->u.set_param.len);
2796         }
2797
2798         return err;
2799 }
2800
2801 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2802                                struct iscsi_uevent *ev, int msg_type)
2803 {
2804         struct iscsi_endpoint *ep;
2805         struct sockaddr *dst_addr;
2806         struct Scsi_Host *shost = NULL;
2807         int non_blocking, err = 0;
2808
2809         if (!transport->ep_connect)
2810                 return -EINVAL;
2811
2812         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2813                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2814                 if (!shost) {
2815                         printk(KERN_ERR "ep connect failed. Could not find "
2816                                "host no %u\n",
2817                                ev->u.ep_connect_through_host.host_no);
2818                         return -ENODEV;
2819                 }
2820                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2821         } else
2822                 non_blocking = ev->u.ep_connect.non_blocking;
2823
2824         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2825         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2826         if (IS_ERR(ep)) {
2827                 err = PTR_ERR(ep);
2828                 goto release_host;
2829         }
2830
2831         ev->r.ep_connect_ret.handle = ep->id;
2832 release_host:
2833         if (shost)
2834                 scsi_host_put(shost);
2835         return err;
2836 }
2837
2838 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2839                                   u64 ep_handle)
2840 {
2841         struct iscsi_cls_conn *conn;
2842         struct iscsi_endpoint *ep;
2843
2844         if (!transport->ep_disconnect)
2845                 return -EINVAL;
2846
2847         ep = iscsi_lookup_endpoint(ep_handle);
2848         if (!ep)
2849                 return -EINVAL;
2850         conn = ep->conn;
2851         if (conn) {
2852                 mutex_lock(&conn->ep_mutex);
2853                 conn->ep = NULL;
2854                 mutex_unlock(&conn->ep_mutex);
2855         }
2856
2857         transport->ep_disconnect(ep);
2858         return 0;
2859 }
2860
2861 static int
2862 iscsi_if_transport_ep(struct iscsi_transport *transport,
2863                       struct iscsi_uevent *ev, int msg_type)
2864 {
2865         struct iscsi_endpoint *ep;
2866         int rc = 0;
2867
2868         switch (msg_type) {
2869         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2870         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2871                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2872                 break;
2873         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2874                 if (!transport->ep_poll)
2875                         return -EINVAL;
2876
2877                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2878                 if (!ep)
2879                         return -EINVAL;
2880
2881                 ev->r.retcode = transport->ep_poll(ep,
2882                                                    ev->u.ep_poll.timeout_ms);
2883                 break;
2884         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2885                 rc = iscsi_if_ep_disconnect(transport,
2886                                             ev->u.ep_disconnect.ep_handle);
2887                 break;
2888         }
2889         return rc;
2890 }
2891
2892 static int
2893 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2894                 struct iscsi_uevent *ev)
2895 {
2896         struct Scsi_Host *shost;
2897         struct sockaddr *dst_addr;
2898         int err;
2899
2900         if (!transport->tgt_dscvr)
2901                 return -EINVAL;
2902
2903         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2904         if (!shost) {
2905                 printk(KERN_ERR "target discovery could not find host no %u\n",
2906                        ev->u.tgt_dscvr.host_no);
2907                 return -ENODEV;
2908         }
2909
2910
2911         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2912         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2913                                    ev->u.tgt_dscvr.enable, dst_addr);
2914         scsi_host_put(shost);
2915         return err;
2916 }
2917
2918 static int
2919 iscsi_set_host_param(struct iscsi_transport *transport,
2920                      struct iscsi_uevent *ev)
2921 {
2922         char *data = (char*)ev + sizeof(*ev);
2923         struct Scsi_Host *shost;
2924         int err;
2925
2926         if (!transport->set_host_param)
2927                 return -ENOSYS;
2928
2929         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2930         if (!shost) {
2931                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2932                        ev->u.set_host_param.host_no);
2933                 return -ENODEV;
2934         }
2935
2936         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2937                                         data, ev->u.set_host_param.len);
2938         scsi_host_put(shost);
2939         return err;
2940 }
2941
2942 static int
2943 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2944 {
2945         struct Scsi_Host *shost;
2946         struct iscsi_path *params;
2947         int err;
2948
2949         if (!transport->set_path)
2950                 return -ENOSYS;
2951
2952         shost = scsi_host_lookup(ev->u.set_path.host_no);
2953         if (!shost) {
2954                 printk(KERN_ERR "set path could not find host no %u\n",
2955                        ev->u.set_path.host_no);
2956                 return -ENODEV;
2957         }
2958
2959         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2960         err = transport->set_path(shost, params);
2961
2962         scsi_host_put(shost);
2963         return err;
2964 }
2965
2966 static int
2967 iscsi_set_iface_params(struct iscsi_transport *transport,
2968                        struct iscsi_uevent *ev, uint32_t len)
2969 {
2970         char *data = (char *)ev + sizeof(*ev);
2971         struct Scsi_Host *shost;
2972         int err;
2973
2974         if (!transport->set_iface_param)
2975                 return -ENOSYS;
2976
2977         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2978         if (!shost) {
2979                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2980                        ev->u.set_iface_params.host_no);
2981                 return -ENODEV;
2982         }
2983
2984         err = transport->set_iface_param(shost, data, len);
2985         scsi_host_put(shost);
2986         return err;
2987 }
2988
2989 static int
2990 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2991 {
2992         struct Scsi_Host *shost;
2993         struct sockaddr *dst_addr;
2994         int err;
2995
2996         if (!transport->send_ping)
2997                 return -ENOSYS;
2998
2999         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3000         if (!shost) {
3001                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3002                        ev->u.iscsi_ping.host_no);
3003                 return -ENODEV;
3004         }
3005
3006         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3007         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3008                                    ev->u.iscsi_ping.iface_type,
3009                                    ev->u.iscsi_ping.payload_size,
3010                                    ev->u.iscsi_ping.pid,
3011                                    dst_addr);
3012         scsi_host_put(shost);
3013         return err;
3014 }
3015
3016 static int
3017 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3018 {
3019         struct iscsi_uevent *ev = nlmsg_data(nlh);
3020         struct Scsi_Host *shost = NULL;
3021         struct iscsi_chap_rec *chap_rec;
3022         struct iscsi_internal *priv;
3023         struct sk_buff *skbchap;
3024         struct nlmsghdr *nlhchap;
3025         struct iscsi_uevent *evchap;
3026         uint32_t chap_buf_size;
3027         int len, err = 0;
3028         char *buf;
3029
3030         if (!transport->get_chap)
3031                 return -EINVAL;
3032
3033         priv = iscsi_if_transport_lookup(transport);
3034         if (!priv)
3035                 return -EINVAL;
3036
3037         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3038         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3039
3040         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3041         if (!shost) {
3042                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3043                        __func__, ev->u.get_chap.host_no);
3044                 return -ENODEV;
3045         }
3046
3047         do {
3048                 int actual_size;
3049
3050                 skbchap = alloc_skb(len, GFP_KERNEL);
3051                 if (!skbchap) {
3052                         printk(KERN_ERR "can not deliver chap: OOM\n");
3053                         err = -ENOMEM;
3054                         goto exit_get_chap;
3055                 }
3056
3057                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3058                                       (len - sizeof(*nlhchap)), 0);
3059                 evchap = nlmsg_data(nlhchap);
3060                 memset(evchap, 0, sizeof(*evchap));
3061                 evchap->transport_handle = iscsi_handle(transport);
3062                 evchap->type = nlh->nlmsg_type;
3063                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3064                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3065                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3066                 buf = (char *)evchap + sizeof(*evchap);
3067                 memset(buf, 0, chap_buf_size);
3068
3069                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3070                                     &evchap->u.get_chap.num_entries, buf);
3071
3072                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3073                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3074                 nlhchap->nlmsg_len = actual_size;
3075
3076                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3077                                           GFP_KERNEL);
3078         } while (err < 0 && err != -ECONNREFUSED);
3079
3080 exit_get_chap:
3081         scsi_host_put(shost);
3082         return err;
3083 }
3084
3085 static int iscsi_set_chap(struct iscsi_transport *transport,
3086                           struct iscsi_uevent *ev, uint32_t len)
3087 {
3088         char *data = (char *)ev + sizeof(*ev);
3089         struct Scsi_Host *shost;
3090         int err = 0;
3091
3092         if (!transport->set_chap)
3093                 return -ENOSYS;
3094
3095         shost = scsi_host_lookup(ev->u.set_path.host_no);
3096         if (!shost) {
3097                 pr_err("%s could not find host no %u\n",
3098                        __func__, ev->u.set_path.host_no);
3099                 return -ENODEV;
3100         }
3101
3102         err = transport->set_chap(shost, data, len);
3103         scsi_host_put(shost);
3104         return err;
3105 }
3106
3107 static int iscsi_delete_chap(struct iscsi_transport *transport,
3108                              struct iscsi_uevent *ev)
3109 {
3110         struct Scsi_Host *shost;
3111         int err = 0;
3112
3113         if (!transport->delete_chap)
3114                 return -ENOSYS;
3115
3116         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3117         if (!shost) {
3118                 printk(KERN_ERR "%s could not find host no %u\n",
3119                        __func__, ev->u.delete_chap.host_no);
3120                 return -ENODEV;
3121         }
3122
3123         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3124         scsi_host_put(shost);
3125         return err;
3126 }
3127
3128 static const struct {
3129         enum iscsi_discovery_parent_type value;
3130         char                            *name;
3131 } iscsi_discovery_parent_names[] = {
3132         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3133         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3134         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3135 };
3136
3137 char *iscsi_get_discovery_parent_name(int parent_type)
3138 {
3139         int i;
3140         char *state = "Unknown!";
3141
3142         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3143                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3144                         state = iscsi_discovery_parent_names[i].name;
3145                         break;
3146                 }
3147         }
3148         return state;
3149 }
3150 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3151
3152 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3153                                      struct iscsi_uevent *ev, uint32_t len)
3154 {
3155         char *data = (char *)ev + sizeof(*ev);
3156         struct Scsi_Host *shost;
3157         struct iscsi_bus_flash_session *fnode_sess;
3158         struct iscsi_bus_flash_conn *fnode_conn;
3159         struct device *dev;
3160         uint32_t idx;
3161         int err = 0;
3162
3163         if (!transport->set_flashnode_param) {
3164                 err = -ENOSYS;
3165                 goto exit_set_fnode;
3166         }
3167
3168         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3169         if (!shost) {
3170                 pr_err("%s could not find host no %u\n",
3171                        __func__, ev->u.set_flashnode.host_no);
3172                 err = -ENODEV;
3173                 goto put_host;
3174         }
3175
3176         idx = ev->u.set_flashnode.flashnode_idx;
3177         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3178         if (!fnode_sess) {
3179                 pr_err("%s could not find flashnode %u for host no %u\n",
3180                        __func__, idx, ev->u.set_flashnode.host_no);
3181                 err = -ENODEV;
3182                 goto put_host;
3183         }
3184
3185         dev = iscsi_find_flashnode_conn(fnode_sess);
3186         if (!dev) {
3187                 err = -ENODEV;
3188                 goto put_sess;
3189         }
3190
3191         fnode_conn = iscsi_dev_to_flash_conn(dev);
3192         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3193         put_device(dev);
3194
3195 put_sess:
3196         put_device(&fnode_sess->dev);
3197
3198 put_host:
3199         scsi_host_put(shost);
3200
3201 exit_set_fnode:
3202         return err;
3203 }
3204
3205 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3206                                struct iscsi_uevent *ev, uint32_t len)
3207 {
3208         char *data = (char *)ev + sizeof(*ev);
3209         struct Scsi_Host *shost;
3210         int index;
3211         int err = 0;
3212
3213         if (!transport->new_flashnode) {
3214                 err = -ENOSYS;
3215                 goto exit_new_fnode;
3216         }
3217
3218         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3219         if (!shost) {
3220                 pr_err("%s could not find host no %u\n",
3221                        __func__, ev->u.new_flashnode.host_no);
3222                 err = -ENODEV;
3223                 goto put_host;
3224         }
3225
3226         index = transport->new_flashnode(shost, data, len);
3227
3228         if (index >= 0)
3229                 ev->r.new_flashnode_ret.flashnode_idx = index;
3230         else
3231                 err = -EIO;
3232
3233 put_host:
3234         scsi_host_put(shost);
3235
3236 exit_new_fnode:
3237         return err;
3238 }
3239
3240 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3241                                struct iscsi_uevent *ev)
3242 {
3243         struct Scsi_Host *shost;
3244         struct iscsi_bus_flash_session *fnode_sess;
3245         uint32_t idx;
3246         int err = 0;
3247
3248         if (!transport->del_flashnode) {
3249                 err = -ENOSYS;
3250                 goto exit_del_fnode;
3251         }
3252
3253         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3254         if (!shost) {
3255                 pr_err("%s could not find host no %u\n",
3256                        __func__, ev->u.del_flashnode.host_no);
3257                 err = -ENODEV;
3258                 goto put_host;
3259         }
3260
3261         idx = ev->u.del_flashnode.flashnode_idx;
3262         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3263         if (!fnode_sess) {
3264                 pr_err("%s could not find flashnode %u for host no %u\n",
3265                        __func__, idx, ev->u.del_flashnode.host_no);
3266                 err = -ENODEV;
3267                 goto put_host;
3268         }
3269
3270         err = transport->del_flashnode(fnode_sess);
3271         put_device(&fnode_sess->dev);
3272
3273 put_host:
3274         scsi_host_put(shost);
3275
3276 exit_del_fnode:
3277         return err;
3278 }
3279
3280 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3281                                  struct iscsi_uevent *ev)
3282 {
3283         struct Scsi_Host *shost;
3284         struct iscsi_bus_flash_session *fnode_sess;
3285         struct iscsi_bus_flash_conn *fnode_conn;
3286         struct device *dev;
3287         uint32_t idx;
3288         int err = 0;
3289
3290         if (!transport->login_flashnode) {
3291                 err = -ENOSYS;
3292                 goto exit_login_fnode;
3293         }
3294
3295         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3296         if (!shost) {
3297                 pr_err("%s could not find host no %u\n",
3298                        __func__, ev->u.login_flashnode.host_no);
3299                 err = -ENODEV;
3300                 goto put_host;
3301         }
3302
3303         idx = ev->u.login_flashnode.flashnode_idx;
3304         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3305         if (!fnode_sess) {
3306                 pr_err("%s could not find flashnode %u for host no %u\n",
3307                        __func__, idx, ev->u.login_flashnode.host_no);
3308                 err = -ENODEV;
3309                 goto put_host;
3310         }
3311
3312         dev = iscsi_find_flashnode_conn(fnode_sess);
3313         if (!dev) {
3314                 err = -ENODEV;
3315                 goto put_sess;
3316         }
3317
3318         fnode_conn = iscsi_dev_to_flash_conn(dev);
3319         err = transport->login_flashnode(fnode_sess, fnode_conn);
3320         put_device(dev);
3321
3322 put_sess:
3323         put_device(&fnode_sess->dev);
3324
3325 put_host:
3326         scsi_host_put(shost);
3327
3328 exit_login_fnode:
3329         return err;
3330 }
3331
3332 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3333                                   struct iscsi_uevent *ev)
3334 {
3335         struct Scsi_Host *shost;
3336         struct iscsi_bus_flash_session *fnode_sess;
3337         struct iscsi_bus_flash_conn *fnode_conn;
3338         struct device *dev;
3339         uint32_t idx;
3340         int err = 0;
3341
3342         if (!transport->logout_flashnode) {
3343                 err = -ENOSYS;
3344                 goto exit_logout_fnode;
3345         }
3346
3347         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3348         if (!shost) {
3349                 pr_err("%s could not find host no %u\n",
3350                        __func__, ev->u.logout_flashnode.host_no);
3351                 err = -ENODEV;
3352                 goto put_host;
3353         }
3354
3355         idx = ev->u.logout_flashnode.flashnode_idx;
3356         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3357         if (!fnode_sess) {
3358                 pr_err("%s could not find flashnode %u for host no %u\n",
3359                        __func__, idx, ev->u.logout_flashnode.host_no);
3360                 err = -ENODEV;
3361                 goto put_host;
3362         }
3363
3364         dev = iscsi_find_flashnode_conn(fnode_sess);
3365         if (!dev) {
3366                 err = -ENODEV;
3367                 goto put_sess;
3368         }
3369
3370         fnode_conn = iscsi_dev_to_flash_conn(dev);
3371
3372         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3373         put_device(dev);
3374
3375 put_sess:
3376         put_device(&fnode_sess->dev);
3377
3378 put_host:
3379         scsi_host_put(shost);
3380
3381 exit_logout_fnode:
3382         return err;
3383 }
3384
3385 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3386                                       struct iscsi_uevent *ev)
3387 {
3388         struct Scsi_Host *shost;
3389         struct iscsi_cls_session *session;
3390         int err = 0;
3391
3392         if (!transport->logout_flashnode_sid) {
3393                 err = -ENOSYS;
3394                 goto exit_logout_sid;
3395         }
3396
3397         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3398         if (!shost) {
3399                 pr_err("%s could not find host no %u\n",
3400                        __func__, ev->u.logout_flashnode.host_no);
3401                 err = -ENODEV;
3402                 goto put_host;
3403         }
3404
3405         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3406         if (!session) {
3407                 pr_err("%s could not find session id %u\n",
3408                        __func__, ev->u.logout_flashnode_sid.sid);
3409                 err = -EINVAL;
3410                 goto put_host;
3411         }
3412
3413         err = transport->logout_flashnode_sid(session);
3414
3415 put_host:
3416         scsi_host_put(shost);
3417
3418 exit_logout_sid:
3419         return err;
3420 }
3421
3422 static int
3423 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3424 {
3425         struct iscsi_uevent *ev = nlmsg_data(nlh);
3426         struct Scsi_Host *shost = NULL;
3427         struct iscsi_internal *priv;
3428         struct sk_buff *skbhost_stats;
3429         struct nlmsghdr *nlhhost_stats;
3430         struct iscsi_uevent *evhost_stats;
3431         int host_stats_size = 0;
3432         int len, err = 0;
3433         char *buf;
3434
3435         if (!transport->get_host_stats)
3436                 return -ENOSYS;
3437
3438         priv = iscsi_if_transport_lookup(transport);
3439         if (!priv)
3440                 return -EINVAL;
3441
3442         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3443         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3444
3445         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3446         if (!shost) {
3447                 pr_err("%s: failed. Cound not find host no %u\n",
3448                        __func__, ev->u.get_host_stats.host_no);
3449                 return -ENODEV;
3450         }
3451
3452         do {
3453                 int actual_size;
3454
3455                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3456                 if (!skbhost_stats) {
3457                         pr_err("cannot deliver host stats: OOM\n");
3458                         err = -ENOMEM;
3459                         goto exit_host_stats;
3460                 }
3461
3462                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3463                                       (len - sizeof(*nlhhost_stats)), 0);
3464                 evhost_stats = nlmsg_data(nlhhost_stats);
3465                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3466                 evhost_stats->transport_handle = iscsi_handle(transport);
3467                 evhost_stats->type = nlh->nlmsg_type;
3468                 evhost_stats->u.get_host_stats.host_no =
3469                                         ev->u.get_host_stats.host_no;
3470                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3471                 memset(buf, 0, host_stats_size);
3472
3473                 err = transport->get_host_stats(shost, buf, host_stats_size);
3474                 if (err) {
3475                         kfree_skb(skbhost_stats);
3476                         goto exit_host_stats;
3477                 }
3478
3479                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3480                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3481                 nlhhost_stats->nlmsg_len = actual_size;
3482
3483                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3484                                           GFP_KERNEL);
3485         } while (err < 0 && err != -ECONNREFUSED);
3486
3487 exit_host_stats:
3488         scsi_host_put(shost);
3489         return err;
3490 }
3491
3492
3493 static int
3494 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3495 {
3496         int err = 0;
3497         struct iscsi_uevent *ev = nlmsg_data(nlh);
3498         struct iscsi_transport *transport = NULL;
3499         struct iscsi_internal *priv;
3500         struct iscsi_cls_session *session;
3501         struct iscsi_cls_conn *conn;
3502         struct iscsi_endpoint *ep = NULL;
3503
3504         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3505                 *group = ISCSI_NL_GRP_UIP;
3506         else
3507                 *group = ISCSI_NL_GRP_ISCSID;
3508
3509         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3510         if (!priv)
3511                 return -EINVAL;
3512         transport = priv->iscsi_transport;
3513
3514         if (!try_module_get(transport->owner))
3515                 return -EINVAL;
3516
3517         switch (nlh->nlmsg_type) {
3518         case ISCSI_UEVENT_CREATE_SESSION:
3519                 err = iscsi_if_create_session(priv, ep, ev,
3520                                               NETLINK_CB(skb).portid,
3521                                               ev->u.c_session.initial_cmdsn,
3522                                               ev->u.c_session.cmds_max,
3523                                               ev->u.c_session.queue_depth);
3524                 break;
3525         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3526                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3527                 if (!ep) {
3528                         err = -EINVAL;
3529                         break;
3530                 }
3531
3532                 err = iscsi_if_create_session(priv, ep, ev,
3533                                         NETLINK_CB(skb).portid,
3534                                         ev->u.c_bound_session.initial_cmdsn,
3535                                         ev->u.c_bound_session.cmds_max,
3536                                         ev->u.c_bound_session.queue_depth);
3537                 break;
3538         case ISCSI_UEVENT_DESTROY_SESSION:
3539                 session = iscsi_session_lookup(ev->u.d_session.sid);
3540                 if (session)
3541                         transport->destroy_session(session);
3542                 else
3543                         err = -EINVAL;
3544                 break;
3545         case ISCSI_UEVENT_UNBIND_SESSION:
3546                 session = iscsi_session_lookup(ev->u.d_session.sid);
3547                 if (session)
3548                         scsi_queue_work(iscsi_session_to_shost(session),
3549                                         &session->unbind_work);
3550                 else
3551                         err = -EINVAL;
3552                 break;
3553         case ISCSI_UEVENT_CREATE_CONN:
3554                 err = iscsi_if_create_conn(transport, ev);
3555                 break;
3556         case ISCSI_UEVENT_DESTROY_CONN:
3557                 err = iscsi_if_destroy_conn(transport, ev);
3558                 break;
3559         case ISCSI_UEVENT_BIND_CONN:
3560                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3561                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3562
3563                 if (conn && conn->ep)
3564                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3565
3566                 if (!session || !conn) {
3567                         err = -EINVAL;
3568                         break;
3569                 }
3570
3571                 ev->r.retcode = transport->bind_conn(session, conn,
3572                                                 ev->u.b_conn.transport_eph,
3573                                                 ev->u.b_conn.is_leading);
3574                 if (ev->r.retcode || !transport->ep_connect)
3575                         break;
3576
3577                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3578                 if (ep) {
3579                         ep->conn = conn;
3580
3581                         mutex_lock(&conn->ep_mutex);
3582                         conn->ep = ep;
3583                         mutex_unlock(&conn->ep_mutex);
3584                 } else
3585                         iscsi_cls_conn_printk(KERN_ERR, conn,
3586                                               "Could not set ep conn "
3587                                               "binding\n");
3588                 break;
3589         case ISCSI_UEVENT_SET_PARAM:
3590                 err = iscsi_set_param(transport, ev);
3591                 break;
3592         case ISCSI_UEVENT_START_CONN:
3593                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3594                 if (conn)
3595                         ev->r.retcode = transport->start_conn(conn);
3596                 else
3597                         err = -EINVAL;
3598                 break;
3599         case ISCSI_UEVENT_STOP_CONN:
3600                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3601                 if (conn)
3602                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3603                 else
3604                         err = -EINVAL;
3605                 break;
3606         case ISCSI_UEVENT_SEND_PDU:
3607                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3608                 if (conn)
3609                         ev->r.retcode = transport->send_pdu(conn,
3610                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3611                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3612                                 ev->u.send_pdu.data_size);
3613                 else
3614                         err = -EINVAL;
3615                 break;
3616         case ISCSI_UEVENT_GET_STATS:
3617                 err = iscsi_if_get_stats(transport, nlh);
3618                 break;
3619         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3620         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3621         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3622         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3623                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3624                 break;
3625         case ISCSI_UEVENT_TGT_DSCVR:
3626                 err = iscsi_tgt_dscvr(transport, ev);
3627                 break;
3628         case ISCSI_UEVENT_SET_HOST_PARAM:
3629                 err = iscsi_set_host_param(transport, ev);
3630                 break;
3631         case ISCSI_UEVENT_PATH_UPDATE:
3632                 err = iscsi_set_path(transport, ev);
3633                 break;
3634         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3635                 err = iscsi_set_iface_params(transport, ev,
3636                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3637                 break;
3638         case ISCSI_UEVENT_PING:
3639                 err = iscsi_send_ping(transport, ev);
3640                 break;
3641         case ISCSI_UEVENT_GET_CHAP:
3642                 err = iscsi_get_chap(transport, nlh);
3643                 break;
3644         case ISCSI_UEVENT_DELETE_CHAP:
3645                 err = iscsi_delete_chap(transport, ev);
3646                 break;
3647         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3648                 err = iscsi_set_flashnode_param(transport, ev,
3649                                                 nlmsg_attrlen(nlh,
3650                                                               sizeof(*ev)));
3651                 break;
3652         case ISCSI_UEVENT_NEW_FLASHNODE:
3653                 err = iscsi_new_flashnode(transport, ev,
3654                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3655                 break;
3656         case ISCSI_UEVENT_DEL_FLASHNODE:
3657                 err = iscsi_del_flashnode(transport, ev);
3658                 break;
3659         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3660                 err = iscsi_login_flashnode(transport, ev);
3661                 break;
3662         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3663                 err = iscsi_logout_flashnode(transport, ev);
3664                 break;
3665         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3666                 err = iscsi_logout_flashnode_sid(transport, ev);
3667                 break;
3668         case ISCSI_UEVENT_SET_CHAP:
3669                 err = iscsi_set_chap(transport, ev,
3670                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3671                 break;
3672         case ISCSI_UEVENT_GET_HOST_STATS:
3673                 err = iscsi_get_host_stats(transport, nlh);
3674                 break;
3675         default:
3676                 err = -ENOSYS;
3677                 break;
3678         }
3679
3680         module_put(transport->owner);
3681         return err;
3682 }
3683
3684 /*
3685  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3686  * Malformed skbs with wrong lengths or invalid creds are not processed.
3687  */
3688 static void
3689 iscsi_if_rx(struct sk_buff *skb)
3690 {
3691         mutex_lock(&rx_queue_mutex);
3692         while (skb->len >= NLMSG_HDRLEN) {
3693                 int err;
3694                 uint32_t rlen;
3695                 struct nlmsghdr *nlh;
3696                 struct iscsi_uevent *ev;
3697                 uint32_t group;
3698
3699                 nlh = nlmsg_hdr(skb);
3700                 if (nlh->nlmsg_len < sizeof(*nlh) ||
3701                     skb->len < nlh->nlmsg_len) {
3702                         break;
3703                 }
3704
3705                 ev = nlmsg_data(nlh);
3706                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3707                 if (rlen > skb->len)
3708                         rlen = skb->len;
3709
3710                 err = iscsi_if_recv_msg(skb, nlh, &group);
3711                 if (err) {
3712                         ev->type = ISCSI_KEVENT_IF_ERROR;
3713                         ev->iferror = err;
3714                 }
3715                 do {
3716                         /*
3717                          * special case for GET_STATS:
3718                          * on success - sending reply and stats from
3719                          * inside of if_recv_msg(),
3720                          * on error - fall through.
3721                          */
3722                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3723                                 break;
3724                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3725                                 break;
3726                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3727                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3728                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3729                 skb_pull(skb, rlen);
3730         }
3731         mutex_unlock(&rx_queue_mutex);
3732 }
3733
3734 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3735 struct device_attribute dev_attr_##_prefix##_##_name =  \
3736         __ATTR(_name,_mode,_show,_store)
3737
3738 /*
3739  * iSCSI connection attrs
3740  */
3741 #define iscsi_conn_attr_show(param)                                     \
3742 static ssize_t                                                          \
3743 show_conn_param_##param(struct device *dev,                             \
3744                         struct device_attribute *attr, char *buf)       \
3745 {                                                                       \
3746         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3747         struct iscsi_transport *t = conn->transport;                    \
3748         return t->get_conn_param(conn, param, buf);                     \
3749 }
3750
3751 #define iscsi_conn_attr(field, param)                                   \
3752         iscsi_conn_attr_show(param)                                     \
3753 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3754                         NULL);
3755
3756 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3757 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3758 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3759 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3760 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3761 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3762 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3763 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3764 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3765 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3766 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3767 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3768 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3769 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3770 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3771 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3772 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3773 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3774 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3775 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3776 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3777 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3778 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3779 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3780 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3781 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3782 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3783 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3784
3785
3786 #define iscsi_conn_ep_attr_show(param)                                  \
3787 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3788                                           struct device_attribute *attr,\
3789                                           char *buf)                    \
3790 {                                                                       \
3791         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3792         struct iscsi_transport *t = conn->transport;                    \
3793         struct iscsi_endpoint *ep;                                      \
3794         ssize_t rc;                                                     \
3795                                                                         \
3796         /*                                                              \
3797          * Need to make sure ep_disconnect does not free the LLD's      \
3798          * interconnect resources while we are trying to read them.     \
3799          */                                                             \
3800         mutex_lock(&conn->ep_mutex);                                    \
3801         ep = conn->ep;                                                  \
3802         if (!ep && t->ep_connect) {                                     \
3803                 mutex_unlock(&conn->ep_mutex);                          \
3804                 return -ENOTCONN;                                       \
3805         }                                                               \
3806                                                                         \
3807         if (ep)                                                         \
3808                 rc = t->get_ep_param(ep, param, buf);                   \
3809         else                                                            \
3810                 rc = t->get_conn_param(conn, param, buf);               \
3811         mutex_unlock(&conn->ep_mutex);                                  \
3812         return rc;                                                      \
3813 }
3814
3815 #define iscsi_conn_ep_attr(field, param)                                \
3816         iscsi_conn_ep_attr_show(param)                                  \
3817 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3818                         show_conn_ep_param_##param, NULL);
3819
3820 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3821 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3822
3823 static struct attribute *iscsi_conn_attrs[] = {
3824         &dev_attr_conn_max_recv_dlength.attr,
3825         &dev_attr_conn_max_xmit_dlength.attr,
3826         &dev_attr_conn_header_digest.attr,
3827         &dev_attr_conn_data_digest.attr,
3828         &dev_attr_conn_ifmarker.attr,
3829         &dev_attr_conn_ofmarker.attr,
3830         &dev_attr_conn_address.attr,
3831         &dev_attr_conn_port.attr,
3832         &dev_attr_conn_exp_statsn.attr,
3833         &dev_attr_conn_persistent_address.attr,
3834         &dev_attr_conn_persistent_port.attr,
3835         &dev_attr_conn_ping_tmo.attr,
3836         &dev_attr_conn_recv_tmo.attr,
3837         &dev_attr_conn_local_port.attr,
3838         &dev_attr_conn_statsn.attr,
3839         &dev_attr_conn_keepalive_tmo.attr,
3840         &dev_attr_conn_max_segment_size.attr,
3841         &dev_attr_conn_tcp_timestamp_stat.attr,
3842         &dev_attr_conn_tcp_wsf_disable.attr,
3843         &dev_attr_conn_tcp_nagle_disable.attr,
3844         &dev_attr_conn_tcp_timer_scale.attr,
3845         &dev_attr_conn_tcp_timestamp_enable.attr,
3846         &dev_attr_conn_fragment_disable.attr,
3847         &dev_attr_conn_ipv4_tos.attr,
3848         &dev_attr_conn_ipv6_traffic_class.attr,
3849         &dev_attr_conn_ipv6_flow_label.attr,
3850         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3851         &dev_attr_conn_tcp_xmit_wsf.attr,
3852         &dev_attr_conn_tcp_recv_wsf.attr,
3853         &dev_attr_conn_local_ipaddr.attr,
3854         NULL,
3855 };
3856
3857 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3858                                          struct attribute *attr, int i)
3859 {
3860         struct device *cdev = container_of(kobj, struct device, kobj);
3861         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3862         struct iscsi_transport *t = conn->transport;
3863         int param;
3864
3865         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3866                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3867         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3868                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3869         else if (attr == &dev_attr_conn_header_digest.attr)
3870                 param = ISCSI_PARAM_HDRDGST_EN;
3871         else if (attr == &dev_attr_conn_data_digest.attr)
3872                 param = ISCSI_PARAM_DATADGST_EN;
3873         else if (attr == &dev_attr_conn_ifmarker.attr)
3874                 param = ISCSI_PARAM_IFMARKER_EN;
3875         else if (attr == &dev_attr_conn_ofmarker.attr)
3876                 param = ISCSI_PARAM_OFMARKER_EN;
3877         else if (attr == &dev_attr_conn_address.attr)
3878                 param = ISCSI_PARAM_CONN_ADDRESS;
3879         else if (attr == &dev_attr_conn_port.attr)
3880                 param = ISCSI_PARAM_CONN_PORT;
3881         else if (attr == &dev_attr_conn_exp_statsn.attr)
3882                 param = ISCSI_PARAM_EXP_STATSN;
3883         else if (attr == &dev_attr_conn_persistent_address.attr)
3884                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3885         else if (attr == &dev_attr_conn_persistent_port.attr)
3886                 param = ISCSI_PARAM_PERSISTENT_PORT;
3887         else if (attr == &dev_attr_conn_ping_tmo.attr)
3888                 param = ISCSI_PARAM_PING_TMO;
3889         else if (attr == &dev_attr_conn_recv_tmo.attr)
3890                 param = ISCSI_PARAM_RECV_TMO;
3891         else if (attr == &dev_attr_conn_local_port.attr)
3892                 param = ISCSI_PARAM_LOCAL_PORT;
3893         else if (attr == &dev_attr_conn_statsn.attr)
3894                 param = ISCSI_PARAM_STATSN;
3895         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3896                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3897         else if (attr == &dev_attr_conn_max_segment_size.attr)
3898                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3899         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3900                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3901         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3902                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3903         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3904                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3905         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3906                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3907         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3908                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3909         else if (attr == &dev_attr_conn_fragment_disable.attr)
3910                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3911         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3912                 param = ISCSI_PARAM_IPV4_TOS;
3913         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3914                 param = ISCSI_PARAM_IPV6_TC;
3915         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3916                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3917         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3918                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3919         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3920                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3921         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3922                 param = ISCSI_PARAM_TCP_RECV_WSF;
3923         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3924                 param = ISCSI_PARAM_LOCAL_IPADDR;
3925         else {
3926                 WARN_ONCE(1, "Invalid conn attr");
3927                 return 0;
3928         }
3929
3930         return t->attr_is_visible(ISCSI_PARAM, param);
3931 }
3932
3933 static struct attribute_group iscsi_conn_group = {
3934         .attrs = iscsi_conn_attrs,
3935         .is_visible = iscsi_conn_attr_is_visible,
3936 };
3937
3938 /*
3939  * iSCSI session attrs
3940  */
3941 #define iscsi_session_attr_show(param, perm)                            \
3942 static ssize_t                                                          \
3943 show_session_param_##param(struct device *dev,                          \
3944                            struct device_attribute *attr, char *buf)    \
3945 {                                                                       \
3946         struct iscsi_cls_session *session =                             \
3947                 iscsi_dev_to_session(dev->parent);                      \
3948         struct iscsi_transport *t = session->transport;                 \
3949                                                                         \
3950         if (perm && !capable(CAP_SYS_ADMIN))                            \
3951                 return -EACCES;                                         \
3952         return t->get_session_param(session, param, buf);               \
3953 }
3954
3955 #define iscsi_session_attr(field, param, perm)                          \
3956         iscsi_session_attr_show(param, perm)                            \
3957 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3958                         NULL);
3959 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3960 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3961 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3962 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3963 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3964 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3965 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3966 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3967 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3968 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3969 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3970 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3971 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3972 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3973 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3974 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3975 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3976 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3977 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3978 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3979 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3980 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3981 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3982 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3983 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3984 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3985 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3986 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3987 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3988 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3989 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3990 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3991 iscsi_session_attr(discovery_auth_optional,
3992                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3993 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3994 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3995 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3996 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3997 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3998 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3999 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4000
4001 static ssize_t
4002 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4003                         char *buf)
4004 {
4005         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4006         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4007 }
4008 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4009                         NULL);
4010 static ssize_t
4011 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4012                         char *buf)
4013 {
4014         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4015         return sprintf(buf, "%d\n", session->creator);
4016 }
4017 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4018                         NULL);
4019 static ssize_t
4020 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4021                             char *buf)
4022 {
4023         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4024         return sprintf(buf, "%d\n", session->target_id);
4025 }
4026 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4027                         show_priv_session_target_id, NULL);
4028
4029 #define iscsi_priv_session_attr_show(field, format)                     \
4030 static ssize_t                                                          \
4031 show_priv_session_##field(struct device *dev,                           \
4032                           struct device_attribute *attr, char *buf)     \
4033 {                                                                       \
4034         struct iscsi_cls_session *session =                             \
4035                         iscsi_dev_to_session(dev->parent);              \
4036         if (session->field == -1)                                       \
4037                 return sprintf(buf, "off\n");                           \
4038         return sprintf(buf, format"\n", session->field);                \
4039 }
4040
4041 #define iscsi_priv_session_attr_store(field)                            \
4042 static ssize_t                                                          \
4043 store_priv_session_##field(struct device *dev,                          \
4044                            struct device_attribute *attr,               \
4045                            const char *buf, size_t count)               \
4046 {                                                                       \
4047         int val;                                                        \
4048         char *cp;                                                       \
4049         struct iscsi_cls_session *session =                             \
4050                 iscsi_dev_to_session(dev->parent);                      \
4051         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4052             (session->state == ISCSI_SESSION_FAILED))                   \
4053                 return -EBUSY;                                          \
4054         if (strncmp(buf, "off", 3) == 0) {                              \
4055                 session->field = -1;                                    \
4056                 session->field##_sysfs_override = true;                 \
4057         } else {                                                        \
4058                 val = simple_strtoul(buf, &cp, 0);                      \
4059                 if (*cp != '\0' && *cp != '\n')                         \
4060                         return -EINVAL;                                 \
4061                 session->field = val;                                   \
4062                 session->field##_sysfs_override = true;                 \
4063         }                                                               \
4064         return count;                                                   \
4065 }
4066
4067 #define iscsi_priv_session_rw_attr(field, format)                       \
4068         iscsi_priv_session_attr_show(field, format)                     \
4069         iscsi_priv_session_attr_store(field)                            \
4070 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4071                         show_priv_session_##field,                      \
4072                         store_priv_session_##field)
4073
4074 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4075
4076 static struct attribute *iscsi_session_attrs[] = {
4077         &dev_attr_sess_initial_r2t.attr,
4078         &dev_attr_sess_max_outstanding_r2t.attr,
4079         &dev_attr_sess_immediate_data.attr,
4080         &dev_attr_sess_first_burst_len.attr,
4081         &dev_attr_sess_max_burst_len.attr,
4082         &dev_attr_sess_data_pdu_in_order.attr,
4083         &dev_attr_sess_data_seq_in_order.attr,
4084         &dev_attr_sess_erl.attr,
4085         &dev_attr_sess_targetname.attr,
4086         &dev_attr_sess_tpgt.attr,
4087         &dev_attr_sess_password.attr,
4088         &dev_attr_sess_password_in.attr,
4089         &dev_attr_sess_username.attr,
4090         &dev_attr_sess_username_in.attr,
4091         &dev_attr_sess_fast_abort.attr,
4092         &dev_attr_sess_abort_tmo.attr,
4093         &dev_attr_sess_lu_reset_tmo.attr,
4094         &dev_attr_sess_tgt_reset_tmo.attr,
4095         &dev_attr_sess_ifacename.attr,
4096         &dev_attr_sess_initiatorname.attr,
4097         &dev_attr_sess_targetalias.attr,
4098         &dev_attr_sess_boot_root.attr,
4099         &dev_attr_sess_boot_nic.attr,
4100         &dev_attr_sess_boot_target.attr,
4101         &dev_attr_priv_sess_recovery_tmo.attr,
4102         &dev_attr_priv_sess_state.attr,
4103         &dev_attr_priv_sess_creator.attr,
4104         &dev_attr_sess_chap_out_idx.attr,
4105         &dev_attr_sess_chap_in_idx.attr,
4106         &dev_attr_priv_sess_target_id.attr,
4107         &dev_attr_sess_auto_snd_tgt_disable.attr,
4108         &dev_attr_sess_discovery_session.attr,
4109         &dev_attr_sess_portal_type.attr,
4110         &dev_attr_sess_chap_auth.attr,
4111         &dev_attr_sess_discovery_logout.attr,
4112         &dev_attr_sess_bidi_chap.attr,
4113         &dev_attr_sess_discovery_auth_optional.attr,
4114         &dev_attr_sess_def_time2wait.attr,
4115         &dev_attr_sess_def_time2retain.attr,
4116         &dev_attr_sess_isid.attr,
4117         &dev_attr_sess_tsid.attr,
4118         &dev_attr_sess_def_taskmgmt_tmo.attr,
4119         &dev_attr_sess_discovery_parent_idx.attr,
4120         &dev_attr_sess_discovery_parent_type.attr,
4121         NULL,
4122 };
4123
4124 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4125                                             struct attribute *attr, int i)
4126 {
4127         struct device *cdev = container_of(kobj, struct device, kobj);
4128         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4129         struct iscsi_transport *t = session->transport;
4130         int param;
4131
4132         if (attr == &dev_attr_sess_initial_r2t.attr)
4133                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4134         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4135                 param = ISCSI_PARAM_MAX_R2T;
4136         else if (attr == &dev_attr_sess_immediate_data.attr)
4137                 param = ISCSI_PARAM_IMM_DATA_EN;
4138         else if (attr == &dev_attr_sess_first_burst_len.attr)
4139                 param = ISCSI_PARAM_FIRST_BURST;
4140         else if (attr == &dev_attr_sess_max_burst_len.attr)
4141                 param = ISCSI_PARAM_MAX_BURST;
4142         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4143                 param = ISCSI_PARAM_PDU_INORDER_EN;
4144         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4145                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4146         else if (attr == &dev_attr_sess_erl.attr)
4147                 param = ISCSI_PARAM_ERL;
4148         else if (attr == &dev_attr_sess_targetname.attr)
4149                 param = ISCSI_PARAM_TARGET_NAME;
4150         else if (attr == &dev_attr_sess_tpgt.attr)
4151                 param = ISCSI_PARAM_TPGT;
4152         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4153                 param = ISCSI_PARAM_CHAP_IN_IDX;
4154         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4155                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4156         else if (attr == &dev_attr_sess_password.attr)
4157                 param = ISCSI_PARAM_USERNAME;
4158         else if (attr == &dev_attr_sess_password_in.attr)
4159                 param = ISCSI_PARAM_USERNAME_IN;
4160         else if (attr == &dev_attr_sess_username.attr)
4161                 param = ISCSI_PARAM_PASSWORD;
4162         else if (attr == &dev_attr_sess_username_in.attr)
4163                 param = ISCSI_PARAM_PASSWORD_IN;
4164         else if (attr == &dev_attr_sess_fast_abort.attr)
4165                 param = ISCSI_PARAM_FAST_ABORT;
4166         else if (attr == &dev_attr_sess_abort_tmo.attr)
4167                 param = ISCSI_PARAM_ABORT_TMO;
4168         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4169                 param = ISCSI_PARAM_LU_RESET_TMO;
4170         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4171                 param = ISCSI_PARAM_TGT_RESET_TMO;
4172         else if (attr == &dev_attr_sess_ifacename.attr)
4173                 param = ISCSI_PARAM_IFACE_NAME;
4174         else if (attr == &dev_attr_sess_initiatorname.attr)
4175                 param = ISCSI_PARAM_INITIATOR_NAME;
4176         else if (attr == &dev_attr_sess_targetalias.attr)
4177                 param = ISCSI_PARAM_TARGET_ALIAS;
4178         else if (attr == &dev_attr_sess_boot_root.attr)
4179                 param = ISCSI_PARAM_BOOT_ROOT;
4180         else if (attr == &dev_attr_sess_boot_nic.attr)
4181                 param = ISCSI_PARAM_BOOT_NIC;
4182         else if (attr == &dev_attr_sess_boot_target.attr)
4183                 param = ISCSI_PARAM_BOOT_TARGET;
4184         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4185                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4186         else if (attr == &dev_attr_sess_discovery_session.attr)
4187                 param = ISCSI_PARAM_DISCOVERY_SESS;
4188         else if (attr == &dev_attr_sess_portal_type.attr)
4189                 param = ISCSI_PARAM_PORTAL_TYPE;
4190         else if (attr == &dev_attr_sess_chap_auth.attr)
4191                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4192         else if (attr == &dev_attr_sess_discovery_logout.attr)
4193                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4194         else if (attr == &dev_attr_sess_bidi_chap.attr)
4195                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4196         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4197                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4198         else if (attr == &dev_attr_sess_def_time2wait.attr)
4199                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4200         else if (attr == &dev_attr_sess_def_time2retain.attr)
4201                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4202         else if (attr == &dev_attr_sess_isid.attr)
4203                 param = ISCSI_PARAM_ISID;
4204         else if (attr == &dev_attr_sess_tsid.attr)
4205                 param = ISCSI_PARAM_TSID;
4206         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4207                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4208         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4209                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4210         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4211                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4212         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4213                 return S_IRUGO | S_IWUSR;
4214         else if (attr == &dev_attr_priv_sess_state.attr)
4215                 return S_IRUGO;
4216         else if (attr == &dev_attr_priv_sess_creator.attr)
4217                 return S_IRUGO;
4218         else if (attr == &dev_attr_priv_sess_target_id.attr)
4219                 return S_IRUGO;
4220         else {
4221                 WARN_ONCE(1, "Invalid session attr");
4222                 return 0;
4223         }
4224
4225         return t->attr_is_visible(ISCSI_PARAM, param);
4226 }
4227
4228 static struct attribute_group iscsi_session_group = {
4229         .attrs = iscsi_session_attrs,
4230         .is_visible = iscsi_session_attr_is_visible,
4231 };
4232
4233 /*
4234  * iSCSI host attrs
4235  */
4236 #define iscsi_host_attr_show(param)                                     \
4237 static ssize_t                                                          \
4238 show_host_param_##param(struct device *dev,                             \
4239                         struct device_attribute *attr, char *buf)       \
4240 {                                                                       \
4241         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4242         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4243         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4244 }
4245
4246 #define iscsi_host_attr(field, param)                                   \
4247         iscsi_host_attr_show(param)                                     \
4248 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4249                         NULL);
4250
4251 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4252 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4253 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4254 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4255 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4256 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4257
4258 static struct attribute *iscsi_host_attrs[] = {
4259         &dev_attr_host_netdev.attr,
4260         &dev_attr_host_hwaddress.attr,
4261         &dev_attr_host_ipaddress.attr,
4262         &dev_attr_host_initiatorname.attr,
4263         &dev_attr_host_port_state.attr,
4264         &dev_attr_host_port_speed.attr,
4265         NULL,
4266 };
4267
4268 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4269                                          struct attribute *attr, int i)
4270 {
4271         struct device *cdev = container_of(kobj, struct device, kobj);
4272         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4273         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4274         int param;
4275
4276         if (attr == &dev_attr_host_netdev.attr)
4277                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4278         else if (attr == &dev_attr_host_hwaddress.attr)
4279                 param = ISCSI_HOST_PARAM_HWADDRESS;
4280         else if (attr == &dev_attr_host_ipaddress.attr)
4281                 param = ISCSI_HOST_PARAM_IPADDRESS;
4282         else if (attr == &dev_attr_host_initiatorname.attr)
4283                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4284         else if (attr == &dev_attr_host_port_state.attr)
4285                 param = ISCSI_HOST_PARAM_PORT_STATE;
4286         else if (attr == &dev_attr_host_port_speed.attr)
4287                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4288         else {
4289                 WARN_ONCE(1, "Invalid host attr");
4290                 return 0;
4291         }
4292
4293         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4294 }
4295
4296 static struct attribute_group iscsi_host_group = {
4297         .attrs = iscsi_host_attrs,
4298         .is_visible = iscsi_host_attr_is_visible,
4299 };
4300
4301 /* convert iscsi_port_speed values to ascii string name */
4302 static const struct {
4303         enum iscsi_port_speed   value;
4304         char                    *name;
4305 } iscsi_port_speed_names[] = {
4306         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4307         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4308         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4309         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4310         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4311 };
4312
4313 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4314 {
4315         int i;
4316         char *speed = "Unknown!";
4317         struct iscsi_cls_host *ihost = shost->shost_data;
4318         uint32_t port_speed = ihost->port_speed;
4319
4320         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4321                 if (iscsi_port_speed_names[i].value & port_speed) {
4322                         speed = iscsi_port_speed_names[i].name;
4323                         break;
4324                 }
4325         }
4326         return speed;
4327 }
4328 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4329
4330 /* convert iscsi_port_state values to ascii string name */
4331 static const struct {
4332         enum iscsi_port_state   value;
4333         char                    *name;
4334 } iscsi_port_state_names[] = {
4335         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4336         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4337 };
4338
4339 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4340 {
4341         int i;
4342         char *state = "Unknown!";
4343         struct iscsi_cls_host *ihost = shost->shost_data;
4344         uint32_t port_state = ihost->port_state;
4345
4346         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4347                 if (iscsi_port_state_names[i].value & port_state) {
4348                         state = iscsi_port_state_names[i].name;
4349                         break;
4350                 }
4351         }
4352         return state;
4353 }
4354 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4355
4356 static int iscsi_session_match(struct attribute_container *cont,
4357                            struct device *dev)
4358 {
4359         struct iscsi_cls_session *session;
4360         struct Scsi_Host *shost;
4361         struct iscsi_internal *priv;
4362
4363         if (!iscsi_is_session_dev(dev))
4364                 return 0;
4365
4366         session = iscsi_dev_to_session(dev);
4367         shost = iscsi_session_to_shost(session);
4368         if (!shost->transportt)
4369                 return 0;
4370
4371         priv = to_iscsi_internal(shost->transportt);
4372         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4373                 return 0;
4374
4375         return &priv->session_cont.ac == cont;
4376 }
4377
4378 static int iscsi_conn_match(struct attribute_container *cont,
4379                            struct device *dev)
4380 {
4381         struct iscsi_cls_session *session;
4382         struct iscsi_cls_conn *conn;
4383         struct Scsi_Host *shost;
4384         struct iscsi_internal *priv;
4385
4386         if (!iscsi_is_conn_dev(dev))
4387                 return 0;
4388
4389         conn = iscsi_dev_to_conn(dev);
4390         session = iscsi_dev_to_session(conn->dev.parent);
4391         shost = iscsi_session_to_shost(session);
4392
4393         if (!shost->transportt)
4394                 return 0;
4395
4396         priv = to_iscsi_internal(shost->transportt);
4397         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4398                 return 0;
4399
4400         return &priv->conn_cont.ac == cont;
4401 }
4402
4403 static int iscsi_host_match(struct attribute_container *cont,
4404                             struct device *dev)
4405 {
4406         struct Scsi_Host *shost;
4407         struct iscsi_internal *priv;
4408
4409         if (!scsi_is_host_device(dev))
4410                 return 0;
4411
4412         shost = dev_to_shost(dev);
4413         if (!shost->transportt  ||
4414             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4415                 return 0;
4416
4417         priv = to_iscsi_internal(shost->transportt);
4418         return &priv->t.host_attrs.ac == cont;
4419 }
4420
4421 struct scsi_transport_template *
4422 iscsi_register_transport(struct iscsi_transport *tt)
4423 {
4424         struct iscsi_internal *priv;
4425         unsigned long flags;
4426         int err;
4427
4428         BUG_ON(!tt);
4429
4430         priv = iscsi_if_transport_lookup(tt);
4431         if (priv)
4432                 return NULL;
4433
4434         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4435         if (!priv)
4436                 return NULL;
4437         INIT_LIST_HEAD(&priv->list);
4438         priv->iscsi_transport = tt;
4439         priv->t.user_scan = iscsi_user_scan;
4440         priv->t.create_work_queue = 1;
4441
4442         priv->dev.class = &iscsi_transport_class;
4443         dev_set_name(&priv->dev, "%s", tt->name);
4444         err = device_register(&priv->dev);
4445         if (err)
4446                 goto free_priv;
4447
4448         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4449         if (err)
4450                 goto unregister_dev;
4451
4452         /* host parameters */
4453         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4454         priv->t.host_attrs.ac.match = iscsi_host_match;
4455         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4456         priv->t.host_size = sizeof(struct iscsi_cls_host);
4457         transport_container_register(&priv->t.host_attrs);
4458
4459         /* connection parameters */
4460         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4461         priv->conn_cont.ac.match = iscsi_conn_match;
4462         priv->conn_cont.ac.grp = &iscsi_conn_group;
4463         transport_container_register(&priv->conn_cont);
4464
4465         /* session parameters */
4466         priv->session_cont.ac.class = &iscsi_session_class.class;
4467         priv->session_cont.ac.match = iscsi_session_match;
4468         priv->session_cont.ac.grp = &iscsi_session_group;
4469         transport_container_register(&priv->session_cont);
4470
4471         spin_lock_irqsave(&iscsi_transport_lock, flags);
4472         list_add(&priv->list, &iscsi_transports);
4473         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4474
4475         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4476         return &priv->t;
4477
4478 unregister_dev:
4479         device_unregister(&priv->dev);
4480         return NULL;
4481 free_priv:
4482         kfree(priv);
4483         return NULL;
4484 }
4485 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4486
4487 int iscsi_unregister_transport(struct iscsi_transport *tt)
4488 {
4489         struct iscsi_internal *priv;
4490         unsigned long flags;
4491
4492         BUG_ON(!tt);
4493
4494         mutex_lock(&rx_queue_mutex);
4495
4496         priv = iscsi_if_transport_lookup(tt);
4497         BUG_ON (!priv);
4498
4499         spin_lock_irqsave(&iscsi_transport_lock, flags);
4500         list_del(&priv->list);
4501         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4502
4503         transport_container_unregister(&priv->conn_cont);
4504         transport_container_unregister(&priv->session_cont);
4505         transport_container_unregister(&priv->t.host_attrs);
4506
4507         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4508         device_unregister(&priv->dev);
4509         mutex_unlock(&rx_queue_mutex);
4510
4511         return 0;
4512 }
4513 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4514
4515 static __init int iscsi_transport_init(void)
4516 {
4517         int err;
4518         struct netlink_kernel_cfg cfg = {
4519                 .groups = 1,
4520                 .input  = iscsi_if_rx,
4521         };
4522         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4523                 ISCSI_TRANSPORT_VERSION);
4524
4525         atomic_set(&iscsi_session_nr, 0);
4526
4527         err = class_register(&iscsi_transport_class);
4528         if (err)
4529                 return err;
4530
4531         err = class_register(&iscsi_endpoint_class);
4532         if (err)
4533                 goto unregister_transport_class;
4534
4535         err = class_register(&iscsi_iface_class);
4536         if (err)
4537                 goto unregister_endpoint_class;
4538
4539         err = transport_class_register(&iscsi_host_class);
4540         if (err)
4541                 goto unregister_iface_class;
4542
4543         err = transport_class_register(&iscsi_connection_class);
4544         if (err)
4545                 goto unregister_host_class;
4546
4547         err = transport_class_register(&iscsi_session_class);
4548         if (err)
4549                 goto unregister_conn_class;
4550
4551         err = bus_register(&iscsi_flashnode_bus);
4552         if (err)
4553                 goto unregister_session_class;
4554
4555         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4556         if (!nls) {
4557                 err = -ENOBUFS;
4558                 goto unregister_flashnode_bus;
4559         }
4560
4561         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4562         if (!iscsi_eh_timer_workq) {
4563                 err = -ENOMEM;
4564                 goto release_nls;
4565         }
4566
4567         return 0;
4568
4569 release_nls:
4570         netlink_kernel_release(nls);
4571 unregister_flashnode_bus:
4572         bus_unregister(&iscsi_flashnode_bus);
4573 unregister_session_class:
4574         transport_class_unregister(&iscsi_session_class);
4575 unregister_conn_class:
4576         transport_class_unregister(&iscsi_connection_class);
4577 unregister_host_class:
4578         transport_class_unregister(&iscsi_host_class);
4579 unregister_iface_class:
4580         class_unregister(&iscsi_iface_class);
4581 unregister_endpoint_class:
4582         class_unregister(&iscsi_endpoint_class);
4583 unregister_transport_class:
4584         class_unregister(&iscsi_transport_class);
4585         return err;
4586 }
4587
4588 static void __exit iscsi_transport_exit(void)
4589 {
4590         destroy_workqueue(iscsi_eh_timer_workq);
4591         netlink_kernel_release(nls);
4592         bus_unregister(&iscsi_flashnode_bus);
4593         transport_class_unregister(&iscsi_connection_class);
4594         transport_class_unregister(&iscsi_session_class);
4595         transport_class_unregister(&iscsi_host_class);
4596         class_unregister(&iscsi_endpoint_class);
4597         class_unregister(&iscsi_iface_class);
4598         class_unregister(&iscsi_transport_class);
4599 }
4600
4601 module_init(iscsi_transport_init);
4602 module_exit(iscsi_transport_exit);
4603
4604 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4605               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4606               "Alex Aizman <itn780@yahoo.com>");
4607 MODULE_DESCRIPTION("iSCSI Transport Interface");
4608 MODULE_LICENSE("GPL");
4609 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4610 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);